> #include <stdio.h>
> #include <ctype.h>
> #include <string.h>
> #define SIZE 512
> 
> int main(void)
> {
> 	int i = 0;
> 	char s[SIZE];
> 	while(gets(s) && strcmp(s, "ENDOFINPUT"))
> 	{
> 		if(! strcmp(s, "START") || ! strcmp(s, "END"))
> 			continue;
> 		for(i = 0; s[i] != 0 && i < SIZE; ++i)
> 		{
> 			if (! isupper(s[i]))
> 				continue;
> 			s[i] -= 5;
> 			if (s[i] < 'A')
> 				s[i] += 26;
> 		}
> 		printf("%s\n", s);
> 	}
> 	return 0;
> }