#include <bits/stdc++.h>

using namespace std;

void solve(int cs) {
  int a[3];
  for (int i = 0; i < 3; i++) cin >> a[i];
  sort(a, a + 3);
  if (a[0] + a[1] > a[2]) {
    if (a[0] == a[1] && a[1] == a[2]) {
      cout << "Equilateral\n";
    } else if (a[0] == a[1] || a[1] == a[2]) {
      cout << "Isosceles\n";
    } else {
      cout << "Scalene\n";
    }
  } else {
    cout << "Not a triangle\n";
  }

}

int32_t main() {
  ios::sync_with_stdio(!cin.tie(0));
  int t = 1;
  // cin >> t;
  for (int i = 1; i <= t; ++i) {
    solve(i);
  }
  return 0;
}