This task involves annotating the answer type to a given question that involve some kind of complex reasoning (including numerical reasoning). Note that the questions require looking at more than one part of the passage to answer. There are 3 possible answer types (i) spans, (ii) numbers and (iii) dates. If the answer can be found in the passage, label it as "span". If the answer is a number, label as "number". Similarly, label "date" if you think the answer to the given question is a date.

Input: Consider Input: Passage: The Greek Navy was relatively modern, strengthened by the recent purchase of numerous new units and undergoing reforms under the supervision of a British mission. Invited by Prime Minister Venizelos in 1910, the mission began its work upon its arrival in May 1911. Granted extraordinary powers and led by Vice Admiral Lionel Grand Tufnell, it thoroughly reorganized the Navy Ministry and dramatically improved the number and quality of exercises in gunnery and fleet maneuvers. In 1912, the core unit of the fleet was the fast armoured cruiser Georgios Averof, completed in 1910 and, at that time, the fastest and most modern warship in the combatant navies. It was complemented by three rather antiquated battleships of the Hydra class. There were also eight destroyers built in 1906-1907, and six new destroyers that were hastily bought in summer 1912 as the imminence of war became apparent. Nevertheless, at the outbreak of the war, the Greek fleet was far from ready. The Ottoman battlefleet retained a clear advantage in number of ships, speed of the main surface units and, more importantly, in the number and caliber of the ships' guns. In addition, as the war caught the fleet in the middle of its expansion and reorganization, fully a third of the fleet  only reached Greece after hostilities had started, forcing the navy to reshuffle crews, who consequently suffered from lacking familiarization and training time. Coal stockpiles and other war stores were also in short supply, while the Georgios Averof had arrived with barely any ammunition, and would remain so until late November.
Question: What is the latter year when eight destroyers were built?

Output: date


Input: Consider Input: Passage: The violence and terror of Pontiac's War convinced many western Pennsylvanians that their government was not doing enough to protect them. This discontent was manifested most seriously in an uprising led by a vigilante group that came to be known as the Paxton Boys, so-called because they were primarily from the area around the Pennsylvania village of Paxton . The Paxtonians turned their anger towards Native Americans—many of them Christians—who lived peacefully in small enclaves in the midst of white Pennsylvania settlements. Prompted by rumors that a Native war party had been seen at the Native village of Conestoga, on December 14, 1763, a group of more than 50 Paxton Boys marched on the village and murdered the six Susquehannocks they found there. Pennsylvania officials placed the remaining 16 Susquehannocks in protective custody in Lancaster, but on December 27 the Paxton Boys broke into the jail and slaughtered most of them. Governor John Penn issued bounties for the arrest of the murderers, but no one came forward to identify them. The Paxton Boys then set their sights on other Native Americans living within eastern Pennsylvania, many of whom fled to Philadelphia for protection. Several hundred Paxtonians marched on Philadelphia in January 1764, where the presence of British troops and Philadelphia militia prevented them from committing more violence. Benjamin Franklin, who had helped organize the local militia, negotiated with the Paxton leaders and brought an end to the immediate crisis. Franklin published a scathing indictment of the Paxton Boys. "If an Indian injures me," he asked, "does it follow that I may revenge that Injury on all Indians?" One leader of the Paxton Boys was Lazarus Stewart who would be killed in the Wyoming Massacre of 1778.
Question: When did the march of the Paxtonians take place?

Output: date


Input: Consider Input: Passage: In July 1449 Esen Tayisi  of the Mongols launched a large-scale, three-pronged invasion of China with his puppet khagan Toqtaq-Buqa. He personally advanced on Datong  in August. The eunuch official Wang Zhen, who dominated the Ming court, encouraged the 22-year-old Zhengtong Emperor to lead his own armies into battle against Esen. The size of Esen's army is unknown but a best guess puts it at some 20,000 men. The Ming army of about 500,000 was hastily assembled; its command was made up of 20 experienced generals and a large entourage of high-ranking civil officials, with Wang Zhen acting as field marshal. On August 3 Esen's army crushed a badly supplied Chinese army at Yanghe, just inside the Great Wall. The same day the Emperor appointed his half-brother Zhu Qiyu as regent. The next day he left Beijing for Juyong Pass. The objective was a short, sharp march west to Datong via the Xuanfu garrison, a campaign into the steppe and then a return to Beijing by a southerly route through Yuzhou. Initially the march was mired by heavy rain. At Juyong Pass the civil officials and generals wanted to halt and send the emperor back to Beijing, but their opinions were overruled by Wang Zhen. On August 16, the army came upon the corpse-strewn battlefield of Yanghe. When it reached Datong on August 18, reports from garrison commanders persuaded Wang Zhen that a campaign into the steppe would be too dangerous. The "expedition" was declared to have reached a victorious conclusion and on August 20 the army set out back toward China proper.
Question: When did Esen Tayisi invade China?


Output: date