如标题，代码如下

#include <cstdio>
#include <iostream>
using namespace std;

char input[50];
int temp[50];

int main() {
	int n;
	scanf("%d\n", &n);
	for (int i = 0; i < 50; i++) {
		scanf("%c", &input[i]);
		if (input[i] == '\n') {
			input[i + 1] = '\0';
			break;
		}
	}
	for (int i = 0; i < 50; i++) {
		temp[i] = (int)input[i];
		if (input[i + 1] == '\0')
			break;
		temp[i] += n;
		printf("%c", (char)temp[i]);
	}
	return 0;
}