You will be given a definition of a task first, then some input of the task.
This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: On 12 January, the Tsar appointed Dmitri Feodorovich Trepov as governor in St Petersburg and dismissed the Minister of the Interior, Pyotr Sviatopolk-Mirskii, on 18 February1905. He appointed a government commission "to enquire without delay into the causes of discontent among the workers in the city of St Petersburg and its suburbs" in view of the strike movement. The commission was headed by Senator NVShidlovsky, a member of the State Council, and included officials, chiefs of government factories, and private factory owners. It was also meant to have included workers' delegates elected according to a two-stage system. Elections of the workers delegates were, however, blocked by the socialists who wanted to divert the workers from the elections to the armed struggle. On 5 March1905, the Commission was dissolved without having started work. Following the assassination of his uncle, the Grand Duke Sergei Aleksandrovich, on 17 February1905, the Tsar made new concessions. On 18 February1905 he published the Bulygin Rescript, which promised the formation of a consultative assembly, religious tolerance, freedom of speech and a reduction in the peasants' redemption payments. On 24 and 25 May1905, about 300 Zemstvo and municipal representatives held three meetings in Moscow, which passed a resolution, asking for popular representation at the national level. On 6 June1905, Nicholas II had received a Zemstvo deputation. Responding to speeches by Prince Sergei Trubetskoi and Mr Fyodrov, the Tsar confirmed his promise to convene an assembly of people's representatives.
Question: How many days was the period between appointing Trepov and dismissing Sviatopolk-Mirskii?
Answer type: Number
Output:
37.