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