using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Linq; using System.Linq.Expressions; using System.Text; namespace Program { class MainClass { //C#Lover/////////////////////////////////////////////////// int N; string[] S, T; void Solve() { io.i(out N); io.ini(out S, out T, N); for (int i = 0; i < N;i++){ if (S[i] != T[i]){ io.o(i + 1); return; } } } //////////////////////////////////////////////////////////// public static void Main(string[] args) { new MainClass().Stream(); } IO io = new IO(); void Stream() { Solve(); io.writeFlush(); } //void Stream() { Test(); io.writeFlush(); } void Test() { 3.REPR(i => io.o(i)); } #region MockMacro //cannot use break,continue,goto void FOR(int a, int b, Action act) { for (int i = a; i < b; i++) act(i); } #endregion } #region default class IO { TYPE tp; string[] nextBuffer; int BufferCnt; char[] cs = new char[] { ' ' }; StreamWriter sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false }; public IO() { nextBuffer = new string[0]; BufferCnt = 0; Console.SetOut(sw); tp = new TYPE(); } public string Next() { if (BufferCnt < nextBuffer.Length) return nextBuffer[BufferCnt++]; string st = Console.ReadLine(); while (st == "") st = Console.ReadLine(); nextBuffer = st.Split(cs, StringSplitOptions.RemoveEmptyEntries); BufferCnt = 0; return nextBuffer[BufferCnt++]; } public string String => Next(); public char Char => char.Parse(String); public int Int => int.Parse(String); public long Long => long.Parse(String); public double Double => double.Parse(String); public string[] arr => Console.ReadLine().Split(' '); public char[] arrChar => Array.ConvertAll(arr, char.Parse); public int[] arrInt => Array.ConvertAll(arr, int.Parse); public long[] arrLong => Array.ConvertAll(arr, long.Parse); public double[] arrDouble => Array.ConvertAll(arr, double.Parse); public T i() { return tp.suitType(String); } public void i(out T v) { v = tp.suitType(String); } public void i(out T v1, out U v2) { i(out v1); i(out v2); } public void i(out T v1, out U v2, out V v3) { i(out v1); i(out v2); i(out v3); } public void i(out T v1, out U v2, out V v3, out W v4) { i(out v1); i(out v2); i(out v3); i(out v4); } public void i(out T v1, out U v2, out V v3, out W v4, out X v5) { i(out v1); i(out v2); i(out v3); i(out v4); i(out v5); } public void ini(out T[] a, int n) { a = new T[n]; for (int i = 0; i < n; i++) a[i] = tp.suitType(String); } public void ini(out T[] a, out T[] b, int n) { a = new T[n]; b = new T[n]; for (int i = 0; i < n; i++) { a[i] = i(); b[i] = i(); } } public void ini(out T[,] a, int h, int w) { a = new T[h, w]; for (int i = 0; i < h; i++) for (int j = 0; j < w; j++) a[i, j] = i(); } public void o(T v) { Console.WriteLine(v); } public void o(params T[] a) { Array.ForEach(a, n => o(n)); } public void ol(T v) { Console.Write(v + " "); } public void ol(params T[] a) { o(connect(a)); } public void or(T a) { Console.Write(a); } public void br() { o(""); } public void writeFlush() { Console.Out.Flush(); } private string connect(params T[] s) { return string.Join(" ", s); } } class TYPE { public bool typeEQ() { return typeof(T).Equals(typeof(U)); } public T convertType(U v) { return (T)Convert.ChangeType(v, typeof(T)); } public T suitType(string s) { if (typeEQ()) return convertType(int.Parse(s)); if (typeEQ()) return convertType(long.Parse(s)); if (typeEQ()) return convertType(double.Parse(s)); if (typeEQ()) return convertType(char.Parse(s)); return convertType(s); } } class PQueue where T : IComparable { public List heap; private Comparison comp; private IComparer comparer; private int size = 0; private int type; public PQueue(int type = 0) : this(Comparer.Default) { this.type = type; } public PQueue(IComparer comparer) : this(16, comparer.Compare) { this.comparer = comparer; } public PQueue(Comparison comparison) : this(16, comparison) { } public PQueue(int capacity, Comparison comparison) { this.heap = new List(capacity); this.comp = comparison; } public void Enqueue(T item) { this.heap.Add(item); var i = size++; while (i > 0) { var p = (i - 1) >> 1; if (Compare(this.heap[p], item) <= 0) break; this.heap[i] = heap[p]; i = p; } this.heap[i] = item; } public T Dequeue() { var ret = this.heap[0]; var x = this.heap[--size]; var i = 0; while ((i << 1) + 1 < size) { var a = (i << 1) + 1; var b = (i << 1) + 2; if (b < size && Compare(heap[b], heap[a]) < 0) a = b; if (Compare(heap[a], x) >= 0) break; heap[i] = heap[a]; i = a; } heap[i] = x; heap.RemoveAt(size); return ret; } public T Peek() { return heap[0]; } public int Count { get { return size; } } public bool Any() { return size > 0; } public bool Empty() { return !Any(); } public bool Contains(T v) { return heap.Contains(v); } private int Compare(T x, T y) { return type == 0 ? x.CompareTo(y) : y.CompareTo(x); } } #endregion #region other class Mat { public int mod = 1000000007;//10^9+7 public long Pow(long a, long b) { if (b == 0) return 1; if (b % 2 == 1) return (a % mod * Pow(a % mod, b - 1) % mod) % mod; else return Pow(a * a % mod, b / 2) % mod; } public long Fact(long n) { long ret = 1; for (long i = 1; i <= n; i++) ret = (ret * i) % mod; return ret; } public long C(long n, long r) { if (r == 0 || n == r) return 1; else if (n == 0) return 0; else if (n < 0 || n < r) throw new ArgumentException("n,r invalid"); else return (Fact(n) % mod * Pow((Fact(n - r) % mod * Fact(r) % mod) % mod, mod - 2) % mod) % mod; } public long DupC(long n, long r) { return C(n + r - 1, r); } public long P(long n, long r) { return Fact(n) / (Fact(n - r)); }//test public bool isPrime(long n) { if (n == 2) return true; if (n < 2 || n % 2 == 0) return false; for (long v = 3; v <= (long)Math.Sqrt(n); v += 2) if (n % v == 0) return false; return true; } public long LCM(long a, long b) { return a * (b / GCD(a, b)); } public long LCM(params long[] a) { return a.Aggregate((v, n) => LCM(v, n)); } public long GCD(long a, long b) { if (a < b) Swap(ref a, ref b); return b == 0 ? a : GCD(b, a % b); } public long GCD(params long[] array) { return array.Aggregate((v, n) => GCD(v, n)); } public T Max(params T[] a) { return a.Max(); } public T Min(params T[] a) { return a.Min(); } public void Swap(ref T a, ref T b) { T tmp = a; a = b; b = tmp; } public double Dis(int x1, int y1, int x2, int y2) { return Math.Sqrt(Math.Pow((x2 - x1), 2) + Math.Pow((y2 - y1), 2)); } public int mDis(int x1, int y1, int x2, int y2) { return Math.Abs(x1 - x2) + Math.Abs(y1 - y2); } public int Digit(long n) { return (n == 0) ? 1 : (int)Math.Log10(n) + 1; } public int DigVal(int n, int dig) { return (n % (int)Pow(10, dig)) / (int)Pow(10, dig - 1); } public int[] DigValArr(int n) { int[] ret = new int[Digit(n)]; ret.Length.REP(i => ret[i] = DigVal(n, i + 1)); return ret; } public long Tousa(long a, long d, int n) { return a + (n - 1) * d; } public long TousaSum(long a, long d, int n) { return n * (2 * a + (n - 1) * d) / 2; } public IEnumerable eunP(int[] Arr, int Use = -1) {//列挙順列 Use = (Use != -1) ? Use : Arr.Length; if (Use == 0 || Arr.Length < Use) yield break; var s = new Stack>(); Arr.Length.REPR(i => s.Push(new List() { i })); while (s.Count > 0) { var cur = s.Pop(); if (cur.Count == Use) { var ret = new List(); cur.ForEach(X => ret.Add(Arr[X])); yield return ret.ToArray(); } else Arr.Length.REPR(i => { if (!cur.Contains(i)) s.Push(new List(cur) { i }); }); } } public IEnumerable enuC(int[] Arr, int Use = -1) {//列挙組み合わせ Use = (Use != -1) ? Use : Arr.Length; if (Use == 0 || Arr.Length < Use) yield break; var s = new Stack>>(); Arr.Length.REPR(i => s.Push(Tuple.Create(i, new List() { Arr[i] }))); while (s.Count > 0) { var cur = s.Pop(); if (cur.Item2.Count == Use) yield return cur.Item2.ToArray(); else for (int i = Arr.GetUpperBound(0); i > cur.Item1; i--) s.Push(Tuple.Create(i, new List(cur.Item2) { Arr[i] })); } } public IEnumerable eunDupP(int[] Arr, int Use = -1) {//列挙重複順列 Use = (Use != -1) ? Use : Arr.Length; if (Use == 0) yield break;var s = new Stack>(); Arr.Length.REPR(i => s.Push(new List() { Arr[i] })); while (s.Count > 0) { var cur = s.Pop(); if (cur.Count == Use) yield return cur.ToArray(); else Arr.Length.REPR(i => s.Push(new List(cur) { Arr[i] })); } } public IEnumerable enuDupC(int[] Arr, int Use = -1) {//列挙組み合わせ Use = (Use != -1) ? Use : Arr.Length; if (Use == 0) yield break; var s = new Stack>>(); Arr.Length.REPR(i => s.Push(Tuple.Create(i, new List() { Arr[i] }))); while (s.Count > 0) { var cur = s.Pop(); if (cur.Item2.Count == Use) yield return cur.Item2.ToArray(); else for (int i = Arr.GetUpperBound(0); i >= cur.Item1; i--) s.Push(Tuple.Create(i, new List(cur.Item2) { Arr[i] })); } } } class AssociativeArray : IEnumerable {//hack:KeyValuePairの利用に制限がかかる public Dictionary dic; public AssociativeArray() { dic = new Dictionary(); } public AssociativeArray(params T[] a) { dic = new Dictionary(); Add(a); } public void Add(params T[] a) { a.Length.REP(i => { if (!conK(a[i])) dic[a[i]] = 0; dic[a[i]]++; }); } public void Set(T k, int v) { if (!dic.ContainsKey(k)) dic[k] = 0; dic[k] = v; } public void Remove(params T[] a) { a.Length.REP(i => { if (conK(a[i])) dic.Remove(a[i]); }); } public T[] Keys() { return dic.Keys.ToArray(); } public int Val(T k) { return (dic.ContainsKey(k)) ? dic[k] : 0; } public int ValSum => dic.Values.Sum(); public int KeyNum => dic.Keys.Count; public int MaxVal => dic.Values.Max(); public int MinVal => dic.Values.Min(); public T MaxKey => dic.First(d => d.Value == MaxVal).Key; public T MinKey => dic.First(d => d.Value == MinVal).Key; public bool conK(T k) { return dic.ContainsKey(k); } public bool anyK(params T[] k) { return k.Any(key => conK(key)); } public bool allK(params T[] k) { return k.All(key => conK(key)); } public void Show() { foreach (var v in dic) { Console.WriteLine(v.Key + " : " + v.Value); } } public IEnumerator GetEnumerator() { foreach (var kp in dic) yield return kp; } //:sort->array } class UnionFind { public int[] parent; public int[] depth; public void Init(int n) { parent = new int[n]; depth = new int[n]; n.REP(i => parent[i] = i); } public int Find(int x) { return (parent[x] == x) ? x : parent[x] = Find(parent[x]); } public void Unite(int x, int y) { x = Find(x); y = Find(y); if (x == y) return; if (depth[x] < depth[y]) parent[x] = y; else { parent[y] = x; if (depth[x] == depth[y]) depth[x]++; } } public bool Same(int a, int b) { return Find(a) == Find(b); } } class Time { public bool isLeapYear(int y) { return (y % 400 == 0 || (y % 4 == 0 && y % 100 != 0)); } } #endregion #region Graph class Index { public int[] Comp(int[] bef) { int[] aft = new int[bef.Length]; var tmp = bef.Distinct().OrderBy(v => v).Select((v, i) => new { v, i }).ToDictionary(p => p.v, p => p.i); aft = bef.Select(v => tmp[v]).ToArray(); return aft; } } class BasicGraph {//けす public List>[] G; public void Init(int n) { G = new List>[n + 1]; G.Length.REP(i => G[i] = new List>()); } public void Dir(int[] f, int[] t) { f.Length.REP(i => G[f[i]].Add(Tuple.Create(t[i], 1L))); } public void Dir(int[] f, int[] t, long[] c) { f.Length.REP(i => G[f[i]].Add(Tuple.Create(t[i], c[i]))); } public void NonDir(int[] f, int[] t) { f.Length.REP(i => { G[f[i]].Add(Tuple.Create(t[i], 1L)); G[t[i]].Add(Tuple.Create(f[i], 1L)); }); } public void NonDir(int[] f, int[] t, long[] c) { f.Length.REP(i => { G[f[i]].Add(Tuple.Create(t[i], c[i])); G[t[i]].Add(Tuple.Create(f[i], c[i])); }); } } class TreeDis {//test public List>[] g; public long[] a2other; private int type; public TreeDis(int type = 0) { this.type = type; }//0->bfs,other->dfs public void Init(long n) { g = new List>[n + 1]; g.Length.REP(i => g[i] = new List>()); } public void Run(long[] a, long[] b) { a.Length.REP(i => { g[a[i]].Add(Tuple.Create(b[i], 1L)); g[b[i]].Add(Tuple.Create(a[i], 1L)); }); } public void Run(long[] a, long[] b, long[] w) { a.Length.REP(i => { g[a[i]].Add(Tuple.Create(b[i], w[i])); g[b[i]].Add(Tuple.Create(a[i], w[i])); }); } public long[] a2iArr(long a) { a2other = new long[g.Count()]; if (type == 0) BFS(a); else DFS(a); return a2other; } private void BFS(long a) { var q = new Queue>(); q.Enqueue(Tuple.Create(a, -1L)); while (q.Count > 0) { var c = q.Dequeue(); foreach (var v in g[c.Item1]) { if (v.Item1 == c.Item2) continue; a2other[v.Item1] = a2other[c.Item1] + v.Item2; q.Enqueue(Tuple.Create(v.Item1, c.Item1)); } } } private void DFS(long a) { var s = new Stack>(); s.Push(Tuple.Create(a, -1L)); while (s.Count > 0) { var c = s.Pop(); foreach (var v in g[c.Item1]) { if (v.Item1 == c.Item2) continue; a2other[v.Item1] = a2other[c.Item1] + v.Item2; s.Push(Tuple.Create(v.Item1, c.Item1)); } } } } class ShortestPath { protected int I = -1; protected long INF = (int)1e9; public List>[] Adj; public void Init(int n) { I = n + 1; Adj = new List>[I]; I.REP(i => Adj[i] = new List>()); } public void AddPath(int f, int t, long c) { Adj[f].Add(Tuple.Create(t, c)); Adj[t].Add(Tuple.Create(f, c)); } public void AddPath(int[] f, int[] t, long[] c) { f.Length.REP(i => AddPath(f[i], t[i], c[i])); } } class Dijkstra : ShortestPath {//隣接対応後検証不足 public long MinCost(int f, int t) { long[] cost = new long[I]; cost.Set(INF); cost[f] = 0; var pq = new PQueue>(); pq.Enqueue(Tuple.Create(f, 0L));//(from,cost) while (pq.Count > 0) { var cur = pq.Dequeue(); if (cost[cur.Item1] < cur.Item2) continue; Adj[cur.Item1].Count.REP(i => { var tmp = Adj[cur.Item1][i]; if (cost[tmp.Item1] > cost[cur.Item1] + tmp.Item2) { cost[tmp.Item1] = cost[cur.Item1] + tmp.Item2; pq.Enqueue(Tuple.Create(tmp.Item1, cost[tmp.Item1])); } }); } return cost[t]; } } class BellmanFord : ShortestPath { public long MinCost(int f, int t) { long[] cost = new long[I]; cost.Set(INF); cost[f] = 0; bool isUpdate = true; while (isUpdate) { isUpdate = false; I.REP(i => Adj[i].Count.REP(j => { var cur = Adj[i][j]; if (cost[cur.Item1] > cost[i] + cur.Item2) { cost[cur.Item1] = cost[i] + cur.Item2; isUpdate = true; } })); } return cost[t]; } } class WarshallFloyd {//そのうちAdjとどっちがいいか...TODO:ジェネリック private int E; private int INF = (int)1e9; public long[,] G; public void Init(int n) { E = n + 1; G = new long[E, E]; G.Set(INF); E.REP(i => G[i, i] = 0); } public void AddPath(int f, int t, long c) { G[f, t] = c; G[t, f] = c; } public void AddPath(int[] f, int[] t, long[] c) { f.Length.REP(i => AddPath(f[i], t[i], c[i])); } public void Run() { G = MinCostArr(); } public long[,] MinCostArr() { E.REP(i => E.REP(j => E.REP(k => G[j, k] = Math.Min(G[j, k], G[j, i] + G[i, k])))); return G; } } #endregion #region Ex static class StringEX {//文字 public static string Reversed(this string s) { return string.Join("", s.Reverse()); } public static string Repeat(this string s, int n) { return string.Concat(Enumerable.Repeat(s, n).ToArray()); } public static int toInt(this string s) { int n; return (int.TryParse(s.TrimStart('0'), out n)) ? n : 0; } public static int toInt(this char c) { return toInt(c.ToString()); } public static int toInt(this char[] c) { return toInt(new string(c)); } public static string toString(this char[] c) { return new string(c); } } static class NumericEx {//数値 public static string pad0(this T v, int n) { return v.ToString().PadLeft(n, '0'); } public static double RoundOff(this double v, int n) { return Math.Round(v, n - 1, MidpointRounding.AwayFromZero); } public static bool Odd(this int v) { return v % 2 != 0; } public static void REP(this int v, Action act) { for (int i = 0; i < v; i++) act(i); } public static void REPR(this int v, Action act) { for (int i = v - 1; i >= 0; i--) act(i); } } static class ArrayEX { public static T[] Sort(this T[] a) { Array.Sort(a); return a; } public static T[] SortR(this T[] a) { Array.Sort(a); Array.Reverse(a); return a; } public static void Set(this T[] a, T v) { a.Length.REP(i => a[i] = v); } public static void Set(this T[,] a, T v) { a.GetLength(0).REP(i => a.GetLength(1).REP(j => a[i, j] = v)); } } static class BitEx { public static bool Any(this BitArray b) { foreach (bool f in b) if (f) return true; return false; } public static bool All(this BitArray b) { foreach (bool f in b) if (!f) return false; return true; } public static bool None(this BitArray b) { return !Any(b); } public static void Flip(this BitArray b, int index) { b.Set(index, !b.Get(index)); } } static class TestEx { //operator } #endregion }