import core.bitop;
import std.algorithm;
import std.ascii;
import std.bigint;
import std.conv;
import std.functional;
import std.math;
import std.numeric;
import std.range;
import std.stdio;
import std.string;
import std.random;
import std.typecons;
import std.container;

alias sread = () => readln.chomp();
ulong bignum = 1_000_000_007;
alias Pair = Tuple!(long, "begin", long, "end");

T lread(T = long)()
{
    return readln.chomp.to!T();
}

T[] aryread(T = long)()
{
    return readln.split.to!(T[])();
}

void scan(TList...)(ref TList Args)
{
    auto line = readln.split();
    foreach (i, T; TList)
    {
        T val = line[i].to!(T);
        Args[i] = val;
    }
}

void main()
{
    auto s = sread();
    auto subary = new char[s.length];
    foreach (i, e; s)
    {
        if (e.iskeyence)
            subary[i] = e;
        else
            subary[i] = '*';
    }
    ulong aster_begin, asetr_end;
    foreach (i, e; subary)
    {
        if (e == '*')
        {
            aster_begin = i;
            break;
        }
    }
    foreach_reverse (i, e; subary)
    {
        if (e == '*')
        {
            asetr_end = i + 1;
            break;
        }
    }
    auto ans = subary[0 .. aster_begin] ~ subary[asetr_end .. $];
    bool flag = true;
    foreach (e; ans)
        flag &= e.iskeyence;

    if(flag && !ans.empty)
        writeln("YES");
    else
        writeln("NO");
}

bool iskeyence(char c)
{
    if (c == 'k')
        return true;
    if (c == 'e')
        return true;
    if (c == 'y')
        return true;
    if (c == 'n')
        return true;
    if (c == 'c')
        return true;

    return false;
}
