Task: Explanation
Input (English): Sofia ( or or ; Bulgarian: София , "Sofiya ", ] ) is the capital and largest city of Bulgaria. 1.26 million people live in the city and 1.68 million people live in its metropolitan area. The city is at the foot of Vitosha Mountain in the western part of the country. Being in the centre of the Balkan peninsula, it is midway between the Black Sea and the Adriatic Sea, and closest to the Aegean Sea. Question: What is special about 1961 Summer Universiade and Sofia, Bulgaria Answer: international sporting event
Output (English):  The city is at the foot of Vitosha Mountain in the western part of the country.