>>4
#include <stdio.h>

int main(void)
{
int a, b, c, s1, s2, s3;

for(a = 0; a < 10; a++) {
for(b = 0; b < 10; b++) {
if(a == b) continue;
for(c = 0; c < 10; c++) {
if(a == c || b == c) continue;
s1 = 4 + 9 + a;
s2 = 3 + b + 7;
s3 = c + 1 + 6;
if(s1 == s2 && s2 == s3) printf("a = %d b = %d c = %d\n", a, b, c);
}}}

return 0;
}