#include <stdio.h>
int main(void){
int c;
printf("Input some characters, then press Ctrl+D.\n");
while ((c = getchar()) != EOF){
if (c == '\t')
printf("\\t");
else if (c == '\b')
printf("\\b");
else if (c == '\\')
printf("\\\\");
else
printf("%c", c);
}
return 0;
}