#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&&n3==n1){
        printf("Equilateral");
    }
    else if(n1==n21||n2==n3||n3==n1){
        printf("Isosceles");
    }
    else {
        printf("Scalene");
    }
}