C :

#include <stdio.h>
#include <assert.h>

int a,b,c;
main(){
   while (3 == scanf("%d%d%d",&a,&b,&c) && (a || b || c)) {
      if (a*a == b*b + c*c || b*b == a*a+c*c || c*c == a*a+b*b) printf("right\n"); else printf("wrong\n");
   }
   assert (!a && !b && !c);
}

C++ :

#include<cstdio>
#include<cmath>
#include<algorithm>
using std::swap;
int main(){
	double a,b,c;
	while(scanf("%lf%lf%lf",&a,&b,&c),(int)(a+b+c)){
		if(a>b) swap(a,b);
		if(a>c) swap(a,c);
		if(b>c) swap(b,c);
		puts(fabs(a*a+b*b-c*c)<0.000001?"right":"wrong");
	}
	return 0;
}