z = int(input("enter a number:"))

def checkz(z):
    if (z <= 0) :
        print ("i dont know what to call zero or -ve numbers -_-, why dont you enter another number")
        z1 = int(input())
        checkz(z1)
    elif (z%2 == 0) : print("its even")
    else : print("its odd")
checkz(z)