Cutting Banner

题面翻译

题意简述

给定只由大写英文字母组成的字符串 $s$，问删掉几个连续的字符（即删去一个子串）之后是否能得到 CODEFORCES。

输入格式

一个长度不超过 $100$ 的字符串 $s$。

输出格式

如果可以得到 CODEFORCES，输出 YES。反之输出 NO。

翻译贡献者 U108949

题目描述

A large banner with word CODEFORCES was ordered for the 1000-th onsite round of Codeforces $^{ω}$ that takes place on the Miami beach. Unfortunately, the company that made the banner mixed up two orders and delivered somebody else's banner that contains someone else's word. The word on the banner consists only of upper-case English letters.

There is very little time to correct the mistake. All that we can manage to do is to cut out some substring from the banner, i.e. several consecutive letters. After that all the resulting parts of the banner will be glued into a single piece (if the beginning or the end of the original banner was cut out, only one part remains); it is not allowed change the relative order of parts of the banner (i.e. after a substring is cut, several first and last letters are left, it is allowed only to glue the last letters to the right of the first letters). Thus, for example, for example, you can cut a substring out from string 'TEMPLATE' and get string 'TEMPLE' (if you cut out string AT), 'PLATE' (if you cut out TEM), 'T' (if you cut out EMPLATE), etc.

Help the organizers of the round determine whether it is possible to cut out of the banner some substring in such a way that the remaining parts formed word CODEFORCES.

输入格式

The single line of the input contains the word written on the banner. The word only consists of upper-case English letters. The word is non-empty and its length doesn't exceed 100 characters. It is guaranteed that the word isn't word CODEFORCES.

输出格式

Print 'YES', if there exists a way to cut out the substring, and 'NO' otherwise (without the quotes).

样例 #1

样例输入 #1

CODEWAITFORITFORCES

样例输出 #1

YES

样例 #2

样例输入 #2

BOTTOMCODER

样例输出 #2

NO

样例 #3

样例输入 #3

DECODEFORCES

样例输出 #3

YES

样例 #4

样例输入 #4

DOGEFORCES

样例输出 #4

NO