Who was the President of Czechoslovakia when an ambassador's tenure began in 1950?
CREATE TABLE table_name_99 (
    czechoslovak_president VARCHAR,
    tenure_begin VARCHAR
)
SELECT czechoslovak_president FROM table_name_99 WHERE tenure_begin = "1950"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who was the President of Czechoslovakia when an ambassador's tenure began in 1950? ### Input: CREATE TABLE table_name_99 (
    czechoslovak_president VARCHAR,
    tenure_begin VARCHAR
) ### Response: SELECT czechoslovak_president FROM table_name_99 WHERE tenure_begin = "1950"