include<stdio.h>

int main() { int n; scanf_s("%d\n", &n); char m; for (int i = 0; i < 55; i++) { m = getchar(); if (m == 10) { break; } else { m += n; if (m > 'z') { m = m % 'z' + 'a'-1; } printf("%c", m); } } return 0; }