how long is the list of countries that won any medals?
14
Rank Nation Gold Silver Bronze Total
1 Nigeria 14 12 9 35
2 Algeria 9 4 4 17
3 Kenya 8 11 4 23
4 Ethiopia 2 4 7 13
5 Ghana 2 2 2 6
6 Ivory Coast 2 1 3 6
7 Egypt 2 1 0 3
8 Senegal 1 1 5 7
9 Morocco 1 1 1 3
10 Tunisia 0 3 1 4
11 Madagascar 0 1 1 2
12 Rwanda 0 0 1 1
12 Zimbabwe 0 0 1 1
12 Seychelles 0 0 1 1
csv/203-csv/377.tsv