题目描述
<span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">输入若干数字，当首次读到</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">10</span><span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">时，输出它是第几个，若已读了</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">20</span><span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">个数字仍没有</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">10</span><span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">，就结束，输出</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">0</span>
输入格式
<span style="font-family:宋体;font-size:14px;line-height:28px;background-color:#F5F5F5;">输入若干数字</span>
输出格式
<span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">当首次读到</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">10</span><span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">时，输出它是第几个，若已读了</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">20</span><span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">个数字仍没有</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">10</span><span style="font-size:14px;line-height:28px;background-color:#F5F5F5;font-family:宋体;">，就结束，输出</span><span style="font-family:'Microsoft Yahei';font-size:14px;line-height:28px;background-color:#F5F5F5;">0</span>
样例
样例输入 1
4 5 6 7 7 2 3 10 6 10 12
样例输出 1
8
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