import std;

alias sread = () => readln.chomp();
alias lread = () => readln.chomp.to!long();
alias aryread(T = long) = () => readln.split.to!(T[]);
//aryread!string();
//auto PS = new Tuple!(long,string)[](M);
//x[]=1;でlong[]全要素1に初期化
void main()
{
    auto s = sread();
    bool[] tmp = [false, false];
    foreach (i; 0 .. s.length)
    {
        foreach (j; 0 .. s.length)
        {
            if (s[i] == 'C' && s[j] == 'F')
            {
                if (i < j)
                {
                    writeln("Yes");
                    return;
                }
            }
        }
    }
    writeln("No");
}

void scan(L...)(ref L A)
{
    auto l = readln.split;
    foreach (i, T; L)
    {
        A[i] = l[i].to!T;
    }
}

void arywrite(T)(T a)
{
    a.map!text.join(' ').writeln;
}
