 Complete the following phrase:  Grzegorz Śledziewski born 18 July 1950 is a Polish sprint canoeist who competed from the early 1970s to the early 1980s. He won fifteen medals at the ICF Canoe Sprint World Championships with three golds K-1 1000 m: 1971, 1975 tied with Italys Oreste Perri; K-2 500 m: 1974, five silvers K-1 500 m: 1970, 1977; K-1 1000 m: 