import re
S = input()

print(re.sub('[a-z]', 'x',S)) import re re S = input() S input() input print(re.sub('[a-z]', 'x',S)) print re.sub('[a-z]', 'x',S) re.sub re sub '[a-z]' 'x' S S = input() input() S
import re
S = input()

print(re.sub('[a-z]', 'x',S))