# __author__ = 'Sony'
from numpy import *
import operator
multiadd = lambda a,b: map(operator.xor, a,b)
a = str
b = str
a = input()
b = input()
al = []
bl = []
 
for i in range(0, len(a)):
    al.append(int(a[i]))
 
for i in range(0, len(b)):
    bl.append(int(b[i]))
# print(multiadd(al[0:len(a)], bl[0 : 0 + len(a)]))
s = 0;
for i in range(0, len(b) - len(a)+1):
    for it in multiadd(al[0:len(a)], bl[i : i + len(a)]):
        # print(it)
        s += it
 
print(s)
# print(a[0:len(a)] == b[1 : 1 + len(a)])
 
 

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