#include<stdio.h>
int main(){  
    int a,b,c;
    printf(" ");
    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("lsosceles\n");
    }else {
        printf("scalene\n");
    }
    return 0; 
}