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: Around dawn on 25 October, Ozawa launched 75 aircraft to attack the 3rd Fleet. Most were shot down by American combat air patrols, and no damage was done to the U.S. ships. A few Japanese planes survived and made their way to land bases on Luzon. During the night, Halsey had passed tactical command of TF38 to Admiral Mitscher, who ordered the American carrier groups to launch their first strike wave, of 180 aircraft, at dawnbefore the Northern Force had been located. When the search aircraft made contact at 07:10, this strike wave was orbiting ahead of the task force. At 08:00, as the attack went in, its escorting fighters destroyed Ozawa's combat air patrol of about 30 planes. The U.S. air strikes continued until the evening, by which time TF38 had flown 527 sorties against the Northern Force, sinking Zuikaku, the light carriers Chitose and Zuiho, and the destroyer Akizuki, all with heavy loss of life. The light carrier Chiyoda and the cruiser Tama were crippled. Ozawa transferred his flag to the light cruiser Oyodo.
Question: How many ships were only crippled during the strike?
Answer type: Number
Output:
2.