#include <bits/stdc++.h>
using namespace std;
int main() {
  map<char, char> rel;
  char a[27];
  char b[27];
  char c[10000], d[10000];
  map<char, char>::iterator it;
  cin >> a;
  cin >> b;
  cin >> c;
  for (int i = 0; i < 26; i++) {
    rel.insert(pair<char, char>(a[i], b[i]));
  }
  for (int i = 0; c[i] != '\0'; i++) {
    if (c[i] >= 48 && c[i] <= 57)
      d[i] = c[i];
    else if (c[i] >= 65 && c[i] <= 90) {
      it = rel.find(c[i] + 32);
      if (it != rel.end()) d[i] = (it->second) - 32;
    } else if (c[i] >= 97 && c[i] <= 122) {
      it = rel.find(c[i]);
      if (it != rel.end()) d[i] = (it->second);
    }
    d[i + 1] = '\0';
  }
  cout << d;
  return 0;
}
