import string
ch = " "
if ch in string.whitespace:
print("yes")
else:
print("no")
ch = "\n"
if ch in string.whitespace:
print("yes")
else:
print("no")
ch = "\t"
if ch in string.whitespace:
print("yes")
else:
print("no")
ch = "_"
if ch in string.whitespace:
print("yes")
else:
print("no")
'''
run:
yes
yes
yes
no
'''