#define _GLIBCXX_FILESYSTEM
#include<bits/stdc++.h>
using namespace std;
#define ll long long

void solve() {
    int A, B, C;
    cin >> A >> B >> C;
    if (A + B <= C || A + C <= B || B + C <= A) {
        cout << "Not a triangle" << endl;
    }
    else if (A == B && B == C) {
        cout << "Equilateral" << endl;
    }
    else if (A == B || B == C || A == C) {
        cout << "Isosceles" << endl;
    }
    else {
        cout << "Scalene" << endl;
    }
    return;
}

int32_t main() {
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    int tc = 1;
    // cin >> tc;
    for(int kase = 1; kase <= tc; kase++) {
        //cout << "Case " << kase << ": ";
        solve();
    }
    return 0;
}