DISTANCE1191 C++

#include <bits/stdc++.h>

using namespace std;

int res = 0;
int da[200],db[200];
string a, b;

void nhap(){
    getline(cin, a);
    getline(cin, b);
}

void xuly(){
    for ( int i = 0; i < a.length(); i++ ){
        // cout << (int)a[i] << " ";
        da[int(a[i])]++;
    }
    for ( int i = 0; i < b.length(); i++ ){
        db[int(b[i])]++;
    }
    for ( int i = 97; i <= 122; i++){
        res =res+abs(da[i]-db[i]);
    }
    cout << res << endl;
}

int main(){
    freopen("DISTANCE1191.INP", "r", stdin);
    freopen("DISTANCE1191.OUT", "w", stdout);
    nhap();
    xuly();
}