def reverse_num_as_int(x):
    if x < 0:
        neg = True
        x = -x
    else:
        neg = False
        
    while not (x % 10):
        x //= 10
    
    rev = 0
    while x:
        rev *= 10
        rev += x % 10
        x //= 10
    
    if neg:
        return -rev
    else:
        return rev


import re
    
def reverse_num_as_str(s):
    if s[0] == '-':
        neg = True
        s = s[1:]
    else:
        neg = False

    s = re.sub(r'^0*', '', s)
    s = re.sub(r'0*$', '', s)
    
    if neg:
        return '-' + s[::-1]
    else:
        return s[::-1]