#include <stdio.h>

void f(char c[]) {
    int i, j;
    for (i = 0; c[i] != '\0'; i++);
    for (j = 0, i--; i > j; i--, j++) {
        char s; s = c[i]; c[i] = c[j]; c[j] = s;
    }
}

int main(void) {
	char c[] = "nobody";
    f(c);
    printf("%s", c);
	return 0;
}