import std.experimental.all;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void main() {
    auto nm = readints;
    int n = nm[0];
    bool found = false;
    for (int i = 0; i < n; i++) {
        auto s = readln.chomp;
        if (s.canFind("LOVE")) {
            found = true;
        }
    }

    writeln(found ? "YES" : "NO");
}