#include<stdio.h>
int main()
{
    int n1,n2,n3;
    scanf("%d %d %d",&n1,%n2&n3);
    if(n1<0||n2<0||n3<0)
    {
        printf("Invalid Input");
    }else if(n1==n2 && n2==n3){
        printf("Equilateral\n");
    }else if(n1==n2 || n2==n3 || n1==n3){
        print("Issosceless\n");
    }else{
        printf("Scalene\n");
    }
}