// https://dmoj.ca/problem/ac19p3
#include <bits/stdc++.h>
using namespace std;
int main() {
int N, L;
cin >> N >> L;
cin.ignore();
string s;
getline(cin, s);
string chars = "abcdefghijklmnopqrstuvwxyz";
map<char, int> ind;
for(int i = 0; i < 26; i++) ind[chars[i]] = i;
for(char x: s) {
if(x == ' ') {
cout << " ";
continue;
}
int cute = ind[x];
cute += L;
cute %= 26;
cout << chars[cute];
}
cout << endl;
}