include<stdio.h>

include<string.h>

int main()

char c[101];
int i,n;
scanf("%d%s",&n,c);//输入向后移的位数和密码.
for(i=0;i<strlen(c);i++)//向后移动n位并确定不会超过26.
{
    c[i]+=n%26;
}
for(i=0;i<strlen(c);i++)//输出字符串.
    printf("%c",c[i]);
return 0;

}