#include <iostream> #include <string> using namespace std; int code(char c) { if (c <= '9') return c - '0'; return 10 + c - 'a'; } void solve() { string s; cin >> s; string d; cin >> d; for (int i = 0; i < d.length(); i += 2) { char c = code(d[i]) * 16; c += code(d[i + 1]); c ^= s[(i / 2) % s.length()]; cout << c; } } int main() { solve(); return 0; }