#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using i128 = __int128;

void solve () {
  int a, b, c;
  cin >> a >> b >> c;
  bool k = 1;
  if (a+b < c) k &= 0;
  if (c+b < a) k &= 0;
  if (a+c < b) k &= 0;
  if (!k) {
    cout << "Not a triangle\n";
    return;
  }
  if (a == b && b == c) {
    cout << "Equilateral\n";
  } else if (a == b || a == c || b == c) {
    cout << "Isosceles\n";
  } else {
    cout << "Scalene\n";
  }
}

int32_t main() {
  auto begin = std::chrono::high_resolution_clock::now();
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int T = 1;
 // cin >> T;
  for(int i = 1; i <= T; i++) {
    //  cout << "Case " << i << ": ";
      solve();
  }
  auto end = std::chrono::high_resolution_clock::now();
  auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
  cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
  return 0;
}