 Complete the following phrase:  Hesz also won six medals at the ICF Canoe Sprint World Championships with two golds K-1 10000 m: 1966, K-1 4 x 500 m: 1971, a silver K-1 4 x 500 m: 1966, and three bronzes K-1 500 m: 1971, K-1 10000 m: 1963, K-1 4 x 500 m: 