Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_99 (czechoslovak_president VARCHAR, tenure_begin VARCHAR)
### Question:
Who was the President of Czechoslovakia when an ambassador's tenure began in 1950?
### Answer:
SELECT czechoslovak_president FROM table_name_99 WHERE tenure_begin = "1950"