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#include <iostream>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <limits.h>
using namespace std;
//#define INT_MAX = 0x7fffffff
//#define INT_MIN = 0x80000000
const int N = 25;
int n;
int a[3];
int main()
{
while (scanf("%d%d%d", &a[0], &a[1], &a[2]) != EOF)
{
sort(a, a + 3);
if (a[0]* a[0] + a[1] * a[1] > a[2] * a[2]) cout << "锐角三角形" << endl;
else if(a[0]* a[0] + a[1] * a[1] == a[2] * a[2]) cout << "直角三角形" << endl;
else cout << "钝角三角形" << endl;
}
return 0;
}