#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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