http://acm.hdu.edu.cn/showproblem.php?pid=1048
//字符串
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char oper[11];
char str[255];
int i, j;
while (scanf("%s%*c", oper)) {
if (strcmp(oper,"START") == 0) {
gets(str);
if (strcmp(str,"END") == 0) continue;
else {
for (i = 0; i <(int) strlen(str); i++) {
if (isalpha(str[i])) {
j = str[i] - 'A';
str[i] = ((j >= 5) ? 'A'+j-5 : 'A'+26+j-5);
......
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