From left, President of the Russian Rhythmic Gymanstics Federaiton Irina Viner-Usmanova, Aleksandra Soldatova of Russia, Arina Averina of Russia and Dina Averina of Russia sing Russian national anthem at the prize giving ceremony at the 36th FIG Rhythmic Gymnastics World Championships at Armeec arena, in Sofia, Bulgaria, September 13, 2018.