#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<int> a(n + 1);
    for(int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    vector<int> b(m + 1);
    for(int i = 1; i <= m; i++) {
        cin >> b[i];
    }
    sort(a.begin() + 1, a.end());
    sort(b.begin() + 1, b.end());
    if(m > n) {
        swap(n, m);
        swap(a, b);
    }
    int ans = 1e18;
    for(int i = 1; i + m - 1 <= n; i++) {
        int r = 0;
        int p = 1;
        for(int j = i; j <= i + m - 1; j++) {
            r = max(r, abs(a[j] - b[p++]));
        }
        ans = min(ans, r);
    }
    cout << ans;
}
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