别打我，逃...

#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;
int main()
{
    int n,ch,pos;
    char password[51];
    char word[27]="abcdefghijklmnopqrstuvwxyz";
    scanf("%d",&n);
    while((ch = getchar()) != '\n')//将缓存去的闲杂字符清除
        continue;
    gets(password);
    for(int i = 0;i < strlen(password);i+=1)
    {
        pos = (password[i]-'a'+n)%strlen(word);//确定下标
        password[i] = word[pos];
    }
    puts(password);
    return 0;
}