HOHANG TS10 Da Nang 2017-2018

#define task "HOHANG"

#include <iostream>
#include <cstdio>

using namespace std;

using ll = long long;
using ld = long double;

constexpr int N = 1e5 + 5;
string S1, S2;
int cntS1[30], cntS2[30];

void Read()
{
    cin >> S1 >> S2;
}

void Solve()
{
    for (auto i : S1)
        ++cntS1[i - 'a'];
    for (auto i : S2)
        ++cntS2[i - 'a'];

    int ans(0);

    for (int i = 0; i < 26; ++i)
        if ((cntS1[i] > 0) != (cntS2[i] > 0))
            ans += cntS1[i] + cntS2[i];

    cout << ans;
}

int32_t main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen(task ".INP", "r"))
    {
        freopen(task ".INP", "r", stdin);
        freopen(task ".OUT", "w", stdout);
    }

    Read();
    Solve();
}