#include<stdio.h>
int main(void){
	int x,y,z;
	while(EOF!=scanf("%d%d%d",&x,&y,&z)){
		if(x<y){
			int t;
			t=x;
			x=y;
			y=t;
		}
		if(x<z){
			int t;
			t=x;
			x=z;
			z=t;
		}
		int t=x*x;
		int m=y*y+z*z;
		if(t>m)
			printf("钝角三角形\n");
		else if(t==m)
			printf("直角三角形\n");
		else
			printf("锐角三角形\n");
	}
	return 0;
}