while 1:
s=input()
while 1:
f=0
for i in range(len(s)-1):
if abs(ord(s[i])-ord(s[i+1]))==32:
s=s[:i]+"**"+s[i+2:]
f=1
t=""
for c in s:
if c!="*":t+=c
s=t
if f==0:break
if s=="":
print(1)
else:
print(0)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).