// Author: Shawn Das Shachin-->(shawn_das)

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define pb push_back
#define mod 1000000007
#define srt(v) sort(v.begin(),v.end())
#define rsrt(v) sort(v.rbegin(),v.rend())
#define OPTIMIZE_IO ios::sync_with_stdio(false); cin.tie(nullptr);

bool istri(int a, int b, int c) {
    return (a + b > c) && (b + c > a) && (a + c > b);
}

string type(int a, int b, int c) {
    if (a == b && b == c) {
        return "Equilateral";
    } else if (a == b || b == c || c == a) {
        return "Isosceles";
    } else {
        return "Scalene";
    }
}

int main() {
    OPTIMIZE_IO;
    int a,b,c;
    cin>>a>>b>>c;
    
    if (!istri(a,b,c)) {
        cout << "Not a triangle" << endl;
    } else {
        cout<<type(a, b, c)<< endl;
    }
    
    return 0;
}