C :

#include<stdio.h>
#include<string.h>
void decipher(char message[]);
char m[100][201];
int main()
{
	char message[201];
	int n;
	scanf("%d",&n);
	getchar();
	for(int i=0;i<n;i++)
		decipher(message);
	for(int i=0;i<n;i++)
	{
		if(i!=n-1)
		printf("%s\n",m[i]);
		else printf("%s",m[i]);
	}
}

void decipher(char message[])
{
	static int k=0;
	char plain[27]="VWXYZABCDEFGHIJKLMNOPQRSTU";
	int i,cipherLen;
	gets(message);
	cipherLen=strlen(message);
	for(i=0;i<cipherLen;i++)
		if(message[i]>='A'&&message[i]<='Z')
			message[i]=plain[message[i]-'A'];
	strcpy(m[k],message);
	k++;
}

C++ :

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

int n;
string s;

int main() {
	scanf("%d\n", &n);
	
	while (n--) {
		getline(cin, s);
		for (int i = 0; i < s.size(); i ++) {
			char ch = s[i];
			
			if (ch >= 'A' && ch <= 'Z') {
				printf("%c", (ch-'A'-5+26)%26 + 'A');
			}
			else {
				cout << ch;
			}
		}
		cout << endl;
	}

	return 0;
}