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