#include <bits/stdc++.h>

using namespace std;
#define FOR(a, b, c) for(int a = b; a < c; ++a)
#define SZ(a) (int)((a).size())
using ll = long long;


const int N = 2e4 + 7;

int dp[N][N];

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    string a, b; cin >> a >> b;

    int xd = 0;
    auto parse = [&](string& s) {
        string res = "";
        for(auto& i : s) {
            if(isdigit(i)) {
                int x = i - '0';
                FOR(d, 0, x) res += "#";
                xd++;
            } else {
                res += i;
            }
        }
        return res;
    };

    string s = parse(a), t = parse(b);
    cerr << s << "\n" << t << "\n";

    int n = SZ(s), m = SZ(t);

    FOR(i, 0, n + 1) FOR(j, 0, m + 1) dp[i][j] = 1e9 + 7;
    FOR(i, 0, n + 1) dp[i][0] = i;
    FOR(j, 0, m + 1) dp[0][j] = j;


    FOR(i, 1, n + 1) {
        FOR(j, 1, m + 1) {
            dp[i][j] = min(dp[i - 1][j], dp[i][j - 1]) + 1;
            if(s[i - 1] == t[j - 1] or s[i - 1] == '#' or t[j - 1] == '#') {
                dp[i][j] = min(dp[i][j], dp[i - 1][j - 1]);
            }
        }
    }

    cout << dp[n][m] + xd << "\n";
}