Main.cc:4:11: warning: multi-character character constant [-Wmultichar]
print('max='+str(a))
^
Main.cc:6:11: warning: multi-character character constant [-Wmultichar]
print('max='+str(b))
^
Main.cc:1:1: error: 'a' does not name a type
a,b = input().split(',')
^