import string
s = " "
if s.isspace():
print("yes")
else:
print("no")
s = "\n"
if s.isspace():
print("yes")
else:
print("no")
s = "\t"
if s.isspace():
print("yes")
else:
print("no")
s = ""
if s.isspace():
print("yes")
else:
print("no")
s = " ."
if s.isspace():
print("yes")
else:
print("no")
'''
run:
yes
yes
yes
no
no
'''