#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");
        return 0;
    }
    if(n1=n2=n3){
        printf("Equilateral");
    }
    else if(n1=n2 || n2=n3 || n3=n1){
        printf("Isosceles");
    }
 
    else(n1!=n2!=n3){
        printf("Scalene");
    }
    
}