#include <bits/stdc++.h>
using namespace std;
const int n = 30;
char a[n], b[n];
char s[10010], ans[10010];
int p[300];
int main() {
  scanf("%s", a + 1);
  for (int i = 1; i <= n; i++) {
    p[a[i]] = i;
  }
  scanf("%s", b + 1);
  scanf("%s", s + 1);
  int len = strlen(s + 1);
  int x = 'a' - 'A';
  for (int i = 1; i <= len; i++) {
    if (s[i] >= '0' && s[i] <= '9')
      ans[i] = s[i];
    else if (s[i] >= 'A' && s[i] <= 'Z')
      ans[i] = b[p[s[i] + x]] - x;
    else
      ans[i] = b[p[s[i]]];
  }
  printf("%s", ans + 1);
  return 0;
}
