#include<stdio.h>

int  main() {
    int n1, n2, n3;
    
    scanf("%d %d %d", &n1,&n2, &n3);
    if (n) <0 || n2 <0 || n3 <0) {
        printf("Invalid Input\n");
    }
    else if (n1 ==n2 || n1 == n3 || n2 == n3) {
        printf("Isosceles\n");
    }
    else {
        printf("Scalene\n");
    }
    
    return 0;
}