#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef double dl;
#define gcd __gcd
#define endl "\n"
#define optimize() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define fraction() cout.unsetf(ios::floatfield); cout.precision(10); cout.setf(ios::fixed,ios::floatfield);
#define mem(a,b) memset(a,b,sizeof(a))

int main()
{
    optimize();
    int a,b,c;
    cin>>a>>b>>c;
    if(a+b<c || b+c<a || c+a<b)
    {
        cout<<"Not a triangle"<<endl;
    }
    else
    {
    if(a!=b && b!=c) cout<<"Scalene"<<endl;
    else if(a==b && b==c) cout<<"Equilateral"<<endl;
    else if (a==b || b==c || a==c) cout<<"Isosceles"<<endl;
    }

    return 0;
}