#include <iostream>
#include <vector>
#include <string>
#include <climits>

using namespace std;

int minTimeToGenerateT(const string& S, const string& T) {
    int n = S.size();
    int m = T.size();
    
 
    vector<vector<int> > dp(n + 1, vector<int>(m + 1, INT_MAX));
    dp[0][0] = 0;
    

    for (int i = 0; i <= n; ++i) {
        for (int j = 0; j <= m; ++j) {
            if (i == 0 && j == 0) continue;
            if (i == 0 || j == 0) {
                dp[i][j] = INT_MAX;
                continue;
            }
            
   
            if (S[i - 1] == T[j - 1]) {
                dp[i][j] = dp[i - 1][j - 1] + 1;
            } else {
           
                for (int k = 0; k < i; ++k) {
                    if (S[k] == T[j - 1]) {
                        dp[i][j] = min(dp[i][j], dp[k][j - 1] + abs(i - k));
                    }
                }
            }
        }
    }
    
    
    return dp[n][m] == INT_MAX ? -1 : dp[n][m];
}

int main() {
    int n, m;
    cin >> n >> m;
    string S, T;
    cin >> S >> T;
    
    int result = minTimeToGenerateT(S, T);
    cout << result << endl;
    
    return 0;
}

answer.code: In function 'int minTimeToGenerateT(const string&, const string&)':
answer.code:32:74: error: 'abs' was not declared in this scope
                         dp[i][j] = min(dp[i][j], dp[k][j - 1] + abs(i - k));\x0d
                                                                          ^