Weekend Lottery (UVALive 3651, Regionals 2006 >> Latin America - South America)

///     Raihan Ruhin
///     CSE, Jahangirnagar University.
///     Dhaka-Bangladesh.
///     id: raihanruhin (topcoder / codeforces / codechef / uva / uvalive / spoj), 3235 (lightoj)
///     mail: raihanruhin@ (yahoo / gmail / facebook)
///     blog: ruhinraihan.blogspot.com

#include<bits/stdc++.h>
using namespace std;

#define SET(a) memset(a,-1,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define PI acos(-1.0)

#define MOD 1000000007
#define MX 100010


int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int tc, kk=1, n, c, k, x, frequency[102];
    string s;
    char ch;
    while(cin>>n>>c>>k && n)
    {
        CLR(frequency);
        for(int i=0;i<n;i++)
            for(int j=0;j<c;j++)
            {
                cin>>x;
                frequency[x]++;
            }
        int mn=1e9;
        for(int i=1;i<=k;i++)   mn=min(mn, frequency[i]);
        bool donefirst=false;
        for(int i=1;i<=k;i++)
        {
            if(mn==frequency[i])
            {
                if(donefirst) cout<<" ";
                cout<<i;
                donefirst=true;
            }
        }

        cout<<"\n";
    }
return 0;
}