#include <iostream>
#include <algorithm>

using namespace std;


int main()
{
    int a[3]={};
    while(cin>>a[0]>>a[1]>>a[2])
	{
    sort(a,a+3);
    if((a[0]*a[0]+a[1]*a[1])==(a[2]*a[2]))
        cout<<"直角三角形"<<endl;
    else if((a[0]*a[0]+a[1]*a[1])<(a[2]*a[2]))
        cout<<"钝角三角形"<<endl;
    else if((a[0]*a[0]+a[1]*a[1])>(a[2]*a[2]))
        cout<<"锐角三角形"<<endl;
	}
    return 0;

}