n=input().strip()
m=input().strip()
if len(n)==len(m):
    if n==m:
        print(2)
    elif n.upper()==m.upper():
        print(3)
    else:
        print(4)
else:
    print(1)
    

/**************************************************************
	Problem: 1475
	User: admin
	Language: Python
	Result: Accepted
	Time:549 ms
	Memory:34244 kb
****************************************************************/