#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#ifdef LOCAL
    #include "debug.h"    
#else
    #define print(...)
    #define printt(...)
#endif

#define int long long

int32_t main() 
{
    // Simple is BEAST
    
    int a, b, c;
    cin >> a >> b >> c;

    if(a > b)swap(a, b);
    if(b > c)swap(c, b);
    if(a > b)swap(a, b);

    if( a + b <= c ) {
        cout << "Not a triangle" << endl;
    }
    else if(a == c) {
        cout << "Equilateral" << endl;
    }else if(a == b or b == c) {
        cout << "Isosceles" << endl;
    }else {
        cout << "Scalene" << endl;
    }
    
    return 0;
}