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