S1=input()
S2=input()
if len(S1)!=len(S2):
print(1)
else:
a=0
b=0
c=0
for i in range(len(S1)):
if S1[i]==S2[i]:
a+=1
if S1[i]==chr(ord(S2[i])+32) or S1[i]==chr(ord(S2[i])-32) or chr(ord(S1[i])+32)==S2[i] or chr(ord(S1[i])-32)==S2[i]:
b+=1
elif S1[i]!=S2[i]:
c+=1
if c!=0:
print(4)
elif b!=0:
print(3)
elif a!=0 and b==0:
print(2)
#ord()函数用于把字母转换为对应的aScll码值
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