problem87.cpp

#include <bits/stdc++.h>
using namespace std;

class SecretMessageDecoder {
  string s, t;

public:
  void readInput() {
    getline(cin, s);
    getline(cin, t);
  }

  bool isValid() {
    if (s.length() != t.length()) return false;

    unordered_map<char, char> s_to_t;
    unordered_map<char, char> t_to_s;

    for (int i = 0; i < s.length(); ++i) {
      char sc = s[i];
      char tc = t[i];

      if (s_to_t.count(sc)) {
        if (s_to_t[sc] != tc) return false; // violates same char mapping
      } else {
        s_to_t[sc] = tc;
      }

      if (t_to_s.count(tc)) {
        if (t_to_s[tc] != sc) return false; // violates unique target
      } else {
        t_to_s[tc] = sc;
      }
    }

    return true;
  }

  void display() {
    cout << (isValid() ? "true" : "alse") << endl;
  }
};

int main() {
  SecretMessageDecoder decoder;
  decoder.readInput();
  decoder.display();
  return 0;
}