import java.util.*; import java.io.*; import java.math.*; class Main{ static final int MOD7 = 1000000007; static final int MOD9 = 998244353 ; static final int inf = (1 << 30); static final long lnf = (1L << 60); final String yes = "Yes"; final String no = "No" ; /////////////////////////////////// /////////////////////////////////// void solve() { String S = in.next(); String T = in.next(); int N = in.nextInt(); StringBuilder ans = new StringBuilder(); ans.append(S); for(int i = 0 ; i < N ; i ++ ) { ans.append("_" + T); } out.print(ans.toString()); } /////////////////////////////////// /////////////////////////////////// public static void main(String[] args) { new Main().solve(); out.flush(); } /////////////////////////////////// static PrintWriter out = new PrintWriter(System.out); static In in = new In(); static Display disp = new Display(); } class Pair, U extends Comparable> implements Comparable> { private final T first; private final U second; Pair(T first, U second) { this.first = first; this.second = second; } T first() { return first; } U second() { return second; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; Pair pair = (Pair) o; return Objects.equals(first, pair.first) && Objects.equals(second, pair.second); } @Override public int hashCode() { return Objects.hash(first, second); } @Override public int compareTo(Pair other) { T f = this.first , F = other.first; U s = this.second , S = other.second; int First_Result = f.compareTo(F); int Second_Result = s.compareTo(S); return First_Result == 0 ? Second_Result : First_Result ; } @Override public String toString() { return "(" + this.first + " , " + this.second + ")"; } } class Triple, U extends Comparable, V extends Comparable> implements Comparable> { private final T first; private final U second; private final V third; Triple(T first, U second, V third) { this.first = first; this.second = second; this.third = third; } T first() { return first; } U second() { return second; } V third() { return third; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; Triple triple = (Triple) o; return Objects.equals(first, triple.first) && Objects.equals(second, triple.second) && Objects.equals(third, triple.third) ; } @Override public int hashCode() { return Objects.hash(first, second, third); } @Override public int compareTo(Triple other) { T f = this.first , F = other.first; U s = this.second , S = other.second; V t = this.third , T = other.third; int First_Result = f.compareTo(F); int Second_Result = s.compareTo(S); int Third_Result = t.compareTo(T); return First_Result == 0 ? (Second_Result == 0 ? Third_Result : Second_Result ) : First_Result; } @Override public String toString() { return "(" + this.first + " , " + this.second + " , " + this.third + ")"; } } class Display { private PrintWriter out = new PrintWriter(System.out); public void display(int [] a) { out.println(Arrays.toString(a)); fl();} public void display(long [] a) { out.println(Arrays.toString(a)); fl();} public void display(double [] a) { out.println(Arrays.toString(a)); fl();} public void display(String [] a) { out.println(Arrays.toString(a)); fl();} public void display(char [] a) { out.println(Arrays.toString(a)); fl();} public void display(boolean [] a) { char [] c = conv(a); display(c); fl();} public void display(int [][] a) { for(int i = 0 ; i < a.length ; i ++ ) out.println(Arrays.toString(a[i])); fl();} public void display(long [][] a) { for(int i = 0 ; i < a.length ; i ++ ) out.println(Arrays.toString(a[i])); fl();} public void display(double [][] a) { for(int i = 0 ; i < a.length ; i ++ ) out.println(Arrays.toString(a[i])); fl();} public void display(String [][] a) { for(int i = 0 ; i < a.length ; i ++ ) out.println(Arrays.toString(a[i])); fl();} public void display(char [][] a) { for(int i = 0 ; i < a.length ; i ++ ) out.println(Arrays.toString(a[i])); fl();} public void display(boolean [][] a) { char [][] c = new char [a.length][a[0].length] ; for(int i = 0 ; i < a.length ; i ++ ) c[i] = conv(a[i]) ; display(c); fl();} private char [] conv(boolean [] a) { char [] c = new char[a.length] ; for(int i = 0 ; i < a.length ; i ++ ) c[i] = a[i] ? 'O' : 'X' ; return c ; } private void fl() { out.flush(); } } class In{ private final InputStream in = System.in; private final byte[] buffer = new byte[1024]; private int ptr = 0; private int buflen = 0; private boolean hasNextByte() { if (ptr < buflen) { return true; }else{ ptr = 0; try { buflen = in.read(buffer); } catch (IOException e) { e.printStackTrace(); } if (buflen <= 0) { return false; } } return true; } private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1; } private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126; } public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) { ptr++; } return hasNextByte(); } String next() { if (!hasNext()) throw new NoSuchElementException(); StringBuilder sb = new StringBuilder(); int b = readByte(); while(isPrintableChar(b)) { sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } long nextLong() { if (!hasNext()) throw new NoSuchElementException(); long n = 0; boolean minus = false; int b = readByte(); if (b == '-') { minus = true; b = readByte(); } if (b < '0' || '9' < b) { throw new NumberFormatException(); } while(true){ if ('0' <= b && b <= '9') { n *= 10; n += b - '0'; }else if(b == -1 || !isPrintableChar(b)){ return minus ? -n : n; }else{ throw new NumberFormatException(); } b = readByte(); } } int nextInt() { long nl = nextLong(); if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException(); return (int) nl; } double nextDouble() { return Double.parseDouble(next()); } char nextChar() { return next().charAt(0); } int [] IntArray(int n) { final int [] Array = new int [n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = nextInt(); } return Array; } int [][] IntArray(int n , int m) { final int [][] Array = new int [n][m]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = IntArray(m); } return Array; } long [] LongArray(int n) { final long [] Array = new long [n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = nextLong(); } return Array; } long [][] LongArray(int n , int m) { final long [][] Array = new long [n][m]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = LongArray(m); } return Array; } String [] StringArray(int n) { final String [] Array = new String [n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = next(); } return Array; } char [] CharArray(int n) { final char [] Array = new char[n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = next().charAt(0); } return Array; } char [][] CharArray(int n , int m) { final char [][] Array = new char [n][m]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = next().toCharArray(); } return Array; } char [][] CharArray2(int n , int m) { final char [][] Array = new char [n][m]; for(int i = 0 ; i < n ; i ++ ) { for(int j = 0 ; j < n ; j ++ ) { Array[i][j] = next().charAt(0); } } return Array; } }