Detailed Instructions: This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
Q: Passage: The Livonian War was fought for control of Old Livonia , when the Tsardom of Russia faced a varying coalition of Denmark-Norway, the Kingdom of Sweden, and the Union of the Grand Duchy of Lithuania and the Kingdom of Poland. During the period 1558-1578, Russia dominated the region with early military successes at Dorpat and Narva. Russian dissolution of the Livonian Confederation brought Poland-Lithuania into the conflict, while Sweden and Denmark both intervened between 1559 and 1561. Swedish Estonia was established despite constant invasion from Russia, and Frederick II of Denmark bought the old Bishopric of Osel-Wiek, which he placed under the control of his brother Magnus of Holstein. Magnus attempted to expand his Livonian holdings to establish the Russian vassal state Kingdom of Livonia, which nominally existed until his defection in 1576. In 1576, Stefan Batory became King of Poland as well as Grand Duke of Lithuania and turned the tide of the war with his successes between 1578 and 1581, including the joint Swedish-Polish-Lithuanian offensive at the Battle of Wenden. This was followed by an extended campaign through Russia culminating in the long and difficult siege of Pskov. Under the 1582 Truce of Jam Zapolski, which ended the war between Russia and Poland-Lithuania, Russia lost all its former holdings in Livonia and Polotsk to Poland-Lithuania. The following year, Sweden and Russia signed the Truce of Plussa with Sweden gaining most of Ingria and northern Livonia while retaining the Duchy of Estonia.
A:
For how many years had Sweden and Denmark both intervened during the Russian dissolution of the Livonian Confederation which brought Poland-Lithuania into the conflict?