#include<stdio.h>
int main()
{
    int n1,n2,n3;
    scanf("%d",&n1);
    scanf("%d",&n2);
    scanf("%d",&n3);
    if(n1==n2 && n2==n3 && n3==n1)
    {
        print("Equiiateral");
    }
    else if(n1==n2 && n2!=n3 || n2==n3 && n3!=n1 || n1==n3 && n2!=n1)
     {
     printf("Isosceles");
     }
     else if(n1 <0|| n2<0|| n3<0)
     }
     printf("Invalid Input");
     }
     else
     {
      printf("Scalence");
     }
     return 0;
     }