#include "cstdio"
#include "algorithm"

using namespace std;

int main()
{
    freopen("cowroute.in" , "r" , stdin ) ;
    freopen("cowroute.out" , "w" , stdout ) ;
    int minim = 1 << 30 ;
    int a , b , n ;
    scanf ( "%d%d%d" , &a , &b , &n ) ;
    for ( int i = 1 ; i <= n ; ++ i )
    {
        int cost , nr ;
        scanf( "%d%d" , & cost , &nr ) ;
        int ok1 = 0 , ok2 = 0 ;
        for ( int j = 1 ; j <= nr ; ++ j )
        {
            int x ;
            scanf ( "%d" , & x ) ;
            if ( x == a )
                ok1 = j ;
            if ( x == b )
                ok2 = j ;
        }
        if ( ok1 and ok2 and ok1 < ok2 )
            minim = min ( cost , minim ) ;
    }
    if ( minim == 1 << 30 )
        printf ( "-1\n" ) ;
    else printf ( "%d\n" , minim ) ;
    return 0;
}