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#include <iostream>
#include <algorithm>
using namespace std;
int main(){
int a, b, c;
while(cin>>a>>b>>c){
int s[3];
s[0] = a;
s[1] = b;
s[2] = c;
sort(s,s+3);
if(s[0]*s[0]+s[1]*s[1]>s[2]*s[2]){
cout<<"锐角三角形"<<endl;;
}
else if(s[0]*s[0]+s[1]*s[1]==s[2]*s[2]){
cout<<"直角三角形"<<endl;
}
else{
cout<<"钝角三角形"<<endl;
}
}
return 0;
}