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14405.cpp
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// 14405. 피카츄
// 2021.09.04
// 문자열
#include<iostream>
#include<string>
using namespace std;
int main()
{
string s;
cin >> s;
bool flag = true;
for (int i = 0; i < s.size(); i++)
{
if (s[i] == 'p')
{
if (s[i + 1] == 'i')
{
i++;
}
else
{
flag = false;
break;
}
}
else if (s[i] == 'k')
{
if (s[i + 1] == 'a')
{
i++;
}
else
{
flag = false;
break;
}
}
else if (s[i] == 'c')
{
if (s[i + 1] == 'h' && s[i + 2] == 'u')
{
i += 2;
}
else
{
flag = false;
break;
}
}
else
{
flag = false;
break;
}
}
if (flag)
{
cout << "YES" << endl;
}
else
{
cout << "NO" << endl;
}
return 0;
}