import std.conv, std.functional, std.stdio, std.string; import std.algorithm, std.array, std.bigint, std.container, std.math, std.numeric, std.range, std.regex, std.typecons; import core.bitop; class EOFException : Throwable { this() { super("EOF"); } } string[] tokens; string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; } int readInt() { return readToken.to!int; } long readLong() { return readToken.to!long; } real readReal() { return readToken.to!real; } bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } } bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } } int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; } int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); } int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); } int A, B, C, D; void main() { try { for (; ; ) { A = readInt(); B = readInt(); C = readInt(); D = readInt(); // foreach(A;1..10)foreach(B;1..10)foreach(C;0..min(A,B)+1)foreach(D;0..10){ debug { writeln([A, B, C, D]); } int V; Tuple!(int, int)[] edges; if (false) { } else if (2 <= C && C == A && C == B && 2 + (C - 2) <= D) { // 0<->1 edges ~= tuple(0, 1); edges ~= tuple(1, 0); V = 2; foreach (i; 0 .. C - 2) { edges ~= tuple(0, V++); } } else if (1 <= C && C == A && C < B && 1 + (C - 1) + (B - C - 1) <= D) { // 1->0 edges ~= tuple(1, 0); V = 2; foreach (i; 0 .. C - 1) { edges ~= tuple(0, V++); } foreach (i; 0 .. B - C - 1) { edges ~= tuple(1, V++); } } else if (1 <= C && C < A && C == B && 1 + (C - 1) + (A - C - 1) <= D) { // 0->1 edges ~= tuple(0, 1); V = 2; foreach (i; 0 .. C - 1) { edges ~= tuple(1, V++); } foreach (i; 0 .. A - C - 1) { edges ~= tuple(0, V++); } } else if (C == 0 && (A - 1) + (B - 1) <= D) { // ...<-0, 1->... V = 2; foreach (i; 0 .. A - 1) { edges ~= tuple(0, V++); } foreach (i; 0 .. B - 1) { edges ~= tuple(1, V++); } } else if (1 <= C && C < A && C < B && 2 + (C - 1) + (A - C - 1) + (B - C - 1) <= D) { // ...<-0->2<-1->... V = 3; edges ~= tuple(0, 2); edges ~= tuple(1, 2); foreach (i; 0 .. C - 1) { edges ~= tuple(2, V++); } foreach (i; 0 .. A - C - 1) { edges ~= tuple(0, V++); } foreach (i; 0 .. B - C - 1) { edges ~= tuple(1, V++); } } if (V) { assert(V == A + B - C); assert(edges.length <= D); writeln(V, " ", edges.length); foreach (e; edges) { writeln(e[0], " ", e[1]); } debug { auto graph = new int[][V]; foreach (e; edges) { graph[e[0]] ~= e[1]; } auto vis = new int[V]; void dfs(int f, int u) { vis[u] |= f; foreach (v; graph[u]) { if (!(vis[v] & f)) { dfs(f, v); } } } dfs(1, 0); dfs(2, 1); int a, b, c; foreach (u; 0 .. V) { if (vis[u] & 1) ++a; if (vis[u] & 2) ++b; if (vis[u] == 3) ++c; } debug { writeln(vis, " ", a, " ", b, " ", c); } assert(a == A && b == B && c == C && edges.length <= D); } } else { writeln(-1); } } } catch (EOFException e) { } }