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