function Main(input) {
    const src = input.split("\n");
    src.pop();
    const a = ["#.#", ".#.", "#.#"].toString();
    const b = [".#.", "#.#", ".#."].toString();
    const c = [...src].toString();
    console.log((a == c || b == c) ? "Yes" : "No");
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));