#include <ctype.h>

int delete_digits(char * s) {
    int res = 0;
    char * p;
    for (p = s; *s != 0; ++s) {
	if (isdigit(*s)) {
	    res = 1;
	} else {
	    *p = *s;
	    p += 1;
	}
    }
    *p = 0;
    return res;
}