func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int lsone(long long int p) { return (p & -p); }   string s1, s2;   int main() {     std::ios::sync_with_stdio(false);     cin >> s1;     cin >> s2;     if (s1 == s2)       cout << -1;     else       cout << max(s1.size(), s2.size());   }   