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))
