题解 | #表示数字#

简单模拟，注意头尾

s=input()
cur, last, n = 0, 0, len(s)
res = []
while cur < n:
    while cur < n and s[cur].isdigit(): cur += 1
    if cur != last:
        res.append(s[last:cur])
        last = cur
    while cur < n and not s[cur].isdigit(): cur += 1
    if cur != last:
        res.append(s[last:cur])
        last = cur
res = "*".join(res)
if res[-1].isdigit(): res += '*'
if res[0].isdigit(): res = '*'+res
print(res)