#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define all(a) a.begin(),a.end()
#define endl '\n'

int main()
{
    ios::sync_with_stdio(0); cin.tie(0);
    int a[3];
    cin>>a[0]>>a[1]>>a[2];
    sort(a,a+3);
    if(a[1]+a[2]>a[0]&&a[0]+a[1]>a[2]&&a[0]+a[2]>a[1])
    {
        if(a[0]==a[1]&&a[1]==a[2])
        {
            cout<<"Equilateral"<<endl;
        }else if((a[0]==a[1]&&a[1]!=a[2])||(a[0]==a[2]&&a[1]!=a[2])||(a[0]!=a[1]&&a[1]==a[2])||(a[0]!=a[2]&&a[1]==a[2]))
        {
            cout<<"Isosceles"<<endl;
        }
        else{
            cout<<"Scalene"<<endl;
        }
    }
    else{
        cout<<"Not a triangle"<<endl;
    }
        
}