/*
    BISMILLAHIR RAHMANIR RAHIM
*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
void solve()
{
    int arr[3];
    cin>>arr[0]>>arr[1]>>arr[2];
    sort(arr,arr+3);
    int a,b,c;a=arr[0];b=arr[1];c=arr[2];
    if(a+b>=c and b+c>=a and c+a>=b)
    {
       if(arr[0]==arr[2])
       {
        cout<<"Equilateral"<<endl;
       }
       else if(arr[0]==arr[1] or arr[1]==arr[2])
       {
        cout<<"Isosceles"<<endl;
       }
       else{
       cout<<"Scalene"<<endl;
       }
    }
    else{
        cout<<"Not a triangle"<<endl;
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t=1;
    // cin>>t;
    while(t--)
    {
      solve();
    }
    return 0;
}