#include <stdlib.h>

extern int __VERIFIER_nondet_int(void);

char *
cstrcat(char *s, const char *append)
{
	char *save = s;

	for (; *s; ++s);
	while ((*s++ = *append++) != '\0');
	return(save);
}

int main() {
    int length1 = __VERIFIER_nondet_int();
    int length2 = __VERIFIER_nondet_int();
    int length3 = __VERIFIER_nondet_int();
    if (length1 < 1) {
        length1 = 1;
    }
    if (length2 < 2) {
        length2 = 2;
    }
    if (length3 < 1) {
        length3 = 1;
    }
    if (length2 - length3 < length1 || length3 > length2) return 0;
    char* nondetString1 = (char*) alloca(length1 * sizeof(char));
    char* nondetString2 = (char*) alloca(length2 * sizeof(char));
    nondetString1[length1-1] = '\0';
    nondetString2[length3-1] = '\0';
    cstrcat(nondetString2,nondetString1);
    return 0;
}