#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define all(v) v.begin(),v.end()
#define endl '\n'
#pragma GCC target("popcnt")
#define bug(...) __f (#__VA_ARGS__, __VA_ARGS__);
template <typename Arg1>void __f (const char* name, Arg1&& arg1) {cout << name << " : " << arg1 << endl;}template <typename Arg1, typename... Args>void __f (const char* names, Arg1&& arg1, Args&&... args){const char* comma = strchr (names + 1, ',');cout.write (names, comma - names) << " : " << arg1 << " | "; __f (comma + 1, args...);}

void solve(ll cs) {
    int a, b, c;
    cin >> a >> b >> c;
    if(a+b<=c || b+c<=a || a+c<=b) cout << "Not a triangle" << endl;
    else if(a==b && b==c) cout << "Equilateral" << endl;
    else if(a==b || b==c || c==a) cout << "Isosceles" << endl;
    else cout << "Scalene" << endl;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
  
    ll t=1, cs=1;
    //cin>>t;
    while(t--) {
        solve(cs++);
    }

    return 0;
}