我这前后加个字符,就很妙 :)
while True:
try:
res, n, s = '', '0123456789', ' ' + input() + ' '
for i in range(len(s) - 1):
res += s[i]
if s[i] not in n and s[i + 1] in n or s[i] in n and s[i + 1] not in n:
res += '*'
print(res[1:])
except:
break 
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