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/**
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. **/
using namespace std;
typedef long long LL;
const double PI = acos(-1.0);
typedef pair<int, int> Author;
vector<pair<string, int> > VP;
LL qkm(LL a, LL b, LL c){
LL res = 1;
for(a %= c; b; b >>= 1, a = a * a % c) if(b & 1) res = res * a % c;
return res;
}
LL Stirling(LL n){
if(n <= 3)
return 1;
else
return (log10(sqrt((long double)2.0 * PI * n)) + (n * (log10((long double)n) - log10((long double)E)))) / log10(10) + 1;
}
LL gcd(LL a, LL b){return b==0?a:gcd(b,a%b);}
LL lcm(LL a, LL b){return a * (b / gcd(a, b));}
inline int max(int a, int b){return a > b ? a : b;}
inline int min(int a, int b){return a > b ? b : a;}
struct Node{
string name;
}people[MAX];
int cmp(const Node& a, const Node& b){
return a.name.size() < b.name.size();
}
LL fac[9] = {1, 2, 6, 24, 120, 720, 5040, 40320, 362880};
LL cal[21] = {1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700, 1767263190, 6564120420};
//{copy(selected,selected+N,ostream_iterator<int>(cout,""));cout<<endl;return;}
/***********************************************************************************************************************************/
char matrix[MAX][MAX];
int ans, len;
int main(void){
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
ios::sync_with_stdio(false); cin.tie(0);
FFI(0, 2) cin>>matrix[i];
ans = 0;len = strlen(matrix[0]);
FFJ(0, len){
if(matrix[0][j] == 48 && matrix[0][j + 1] == 48 && matrix[1][j] == 48){ans++;matrix[0][j] = 88;matrix[0][j + 1] = 88;matrix[1][j] = 88;}
if(matrix[0][j] == 48 && matrix[0][j + 1] == 48 && matrix[1][j + 1] == 48){ans++;matrix[0][j] = 88;matrix[0][j + 1] = 88;matrix[1][j + 1] = 88;}
if(matrix[0][j + 1] == 48 && matrix[1][j] == 48 && matrix[1][j + 1] == 48){ans++;matrix[0][j + 1] = 88;matrix[1][j] = 88;matrix[1][j + 1] = 88;}
if(matrix[0][j] == 48 && matrix[1][j] == 48 && matrix[1][j + 1] == 48){ans++;matrix[0][j] = 88;matrix[1][j] = 88;matrix[1][j + 1] = 88;}
}
cout<<ans<<endl;
return EXIT_SUCCESS;
}
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