def kaprekarNumbers(p, q):
    count = 0
    for i in range(p,q+1):
        op = str(i**2)
        count_digit = str(i)
        count_digit = len(count_digit)
        right = op[-count_digit:]
        left = op[:(len(op)-count_digit)]

        if len(right)== 0:
            left = int(left)
            right = 0
        elif len(left)== 0:
            right = int(right)
            left=0    
        else:    
            right = int("".join(str(num) for num in right))
            left = int("".join(str(num) for num in left))

        if right + left == i:
            print(i,end=' ')
            count+=1

    if count == 0:
        print('INVALID RANGE')