#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef pair<int,int> pi;
typedef pair<long long,long long> pl;
typedef long double ld;
#define all(s) s.begin(),s.end()
#define F first
#define S second
#define sz(a) a.size()
#define int long long
const int mod = 998244353;
const int INF = 1e18;
const int N = 100200;
const int M = 5000;
const int inf = 1e9;
long long binpow(long long a, long long b, long long m) {
a %= m;
long long res = 1;
while (b > 0) {
if (b & 1)
res = res * a % m;
a = a * a % m;
b >>= 1;
}
return res;
}
void solve() {
int n,m;
cin>>n>>m;
int l[n+1];
int r[n+1];
for(int i=1;i<=n;++i) {
cin>>l[i];
}
for(int i=1;i<=m;++i) {
cin>>r[i];
}
sort(l+1,l+1+n);
sort(r+1,r+1+m);
int mx=0;
for(int i=1;i<=n;++i) {
mx=max(abs(l[i]-r[i]),mx);
}
cout<<mx<<'\n';
}
signed main() {
ios_base::sync_with_stdio(0) , cin.tie(0) , cout.tie(0);
int T=1;
//cin>>T;
while(T--) {
solve();
}
return 0;
}
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