#include <stdio.h>
int a,b,c;
scanf("%d %d %d",&a,&b,&c);
if(a <= 0 || b <= 0 || c <= o) {
printf("Invalid Input");
}
else if(a ==b && b ==c){
    printf("Equilateral");
}
    else if(a==b || b==c || a==c){
        printf("Isosceles");
        else{
            printf("Scalene");        
    }
    return 0;
}