#include <stdio.h>
#ifndef bool
#define bool int
#define true 1
#define false 0
#endif
#define putbool(x) (printf("%s", (x) ? "TRUE" : "FALSE"))

int get_char(char *s) {
    *s = getchar();
    return *s != EOF && *s != '\n' && *s != '\r';
}

int main() {
    char c;
    while (get_char(&c)) {
        if (c > 'z' || c < 'a') {
            putbool(false);
            return 0;
        }
    }
    putbool(true);
    return 0;
}