def power(base,exponent):
    if exponent == 0:
        return 1
    return base*power(base,exponent-1)

def countDigits(number):
    if (number<10):
        return 1
    return 1+ countDigits(number//10)

def sumRange(low,high):
    if (low == high):
        return high
    else:
        return low+sumRange(low+1,high)