#include <stdio.h>
int main(){
    inta,b,c;
    scanf("%d%d%d",&a,&b,&c);
    
    if(a<=0 || b<=0 || c<=0) {
        printf("invalid input\n");
        
        
    }
    else if (a == b && b == c ) {
        printf("Equilateral\n");
        
    }
    else if (a == b || b == c || a == c){
        printf("Isosceles\n");
        
    }
    else{
        printf("Scalene\n");
        
    }
    return 0;
}