Instructions: 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.
Input: Passage: In the early 16th century, the present-day Myanmar comprised several small kingdoms. The two traditional powers that had dominated the Irrawaddy valley since the 14th century, the Kingdom of Ava and Hanthawaddy Kingdom, were in serious decline. By the 1530s, the old powers had been or were being eclipsed by upstart powers. In Upper Burma, the Mohnyin-led Confederation of Shan States finally finished off Ava in 1527. On the western coast, the Kingdom of Mrauk U was ascendant at the expense of a weak Bengal, extending its reach into the Ganges Delta in 1533. In the south, the Taungoo-Hanthawaddy War resulted in a Hanthawaddy victory in 1538-39, and Martaban in 1541, giving the men from the small frontier outpost total control of Lower Burma. Taungoo's meteoric rise raised alarm amongst other powers. In 1539, Ava and Mrauk U entered into an alliance to defend Ava's vassal state of Prome. But their poorly coordinated forces could not stop better organized Taungoo forces from taking over Prome in 1542. After his army's crushing defeat at Padaung Pass, King Min Bin of Mrauk U left the alliance. Convinced that Taungoo's guns would eventually point toward his kingdom, Min Bin beefed up the already formidable defenses around his capital. In the following three years, Taungoo completed its takeover of central Burma up to Bagan, which Ava formally ceded in exchange for peace in 1545. King Tabinshwehti had now built the largest polity in Burma since the fall of the Pagan Kingdom in 1287. But as his upcoming campaigns in Arakan and Thailand show he was still intent on expanding elsewhere.
Question: How many years were between the Ava and Mrauk U alliance and the Taungoo forces from taking over Prome ?
Answer type: Number
Output:
3.