01: #include<stdio.h>
02:
03: int main(void)
04: {
05: char str[40];
06: int i;
07:
08: printf("Input: ");
09: scanf("%s", str);
10:
11: for(i = 0;str[i] != '\0';i++){
12: if('A' <= str[i] && str[i] <= 'Z'){
13: printf("%c", str[i]);
14: }
15: else{
16: printf("@");
17: }
18: }
19: printf("\n");
20:
21: return 0;
22: }