import re
if re.fullmatch(r'[0-9][*+/xX-][0-9]', '5+5'):
print('5+5 string found!')
if re.fullmatch(r'[0-9][*+/xX-][0-9]', '5+56'):
print('5+56 string found!')
aW1wb3J0IHJlCmlmIHJlLmZ1bGxtYXRjaChyJ1swLTldWyorL3hYLV1bMC05XScsICc1KzUnKToKCXByaW50KCc1KzUgc3RyaW5nIGZvdW5kIScpCmlmIHJlLmZ1bGxtYXRjaChyJ1swLTldWyorL3hYLV1bMC05XScsICc1KzU2Jyk6CglwcmludCgnNSs1NiBzdHJpbmcgZm91bmQhJyk=