
76  ZOJ 7th Anniversary Contest  E
Given a string of characters, you may find that the word "seven" is hidden inside. For example, in the string "sesveven", five 7's are hidden: sesveven sesveven sesveven sesveven sesvevenYour task is to count the number of different 7's. Note Uppercase letters are considered as the same as the lowercase letters. Input Each case gives the string in a line. The length of the string is not more than 10000. Output For each test cases, output in a line the number of different 7's hidden inside the string. The result will be less than 2^63. Sample Input sesveven seSvevEn Sample Output 5 5 Author: CHEN, Yue Source: ZOJ 7th Anniversary Contest 