var input = require("fs").readFileSync("/dev/stdin", "utf8");
input = input.split("\n");
var point = [];
for (var i = 0; i < 5; i++) {
    var tmp = input[i].split(" ");
    point.push([+tmp[0], +tmp[1]]);
}
var count = 0; // 条件を満たす2点の組の数
for (var p1 = 0; p1 < 5; p1++) {
    for (var p2 = 0; p2 < 5; p2++) {
        if (p1 == p2)
            continue;
        var flg = true;
        var cnt_p = 0; // +
        var cnt_m = 0; // -
        for (var p3 = 0; p3 < 5; p3++) {
            if (p3 == p1 || p3 == p2)
                continue;
            var dx1 = point[p2][0] - point[p1][0];
            var dy1 = point[p2][1] - point[p1][1];
            var dx2 = point[p3][0] - point[p1][0];
            var dy2 = point[p3][1] - point[p1][1];
            var deg1 = Math.atan2(dy1, dx1);
            var deg2 = Math.atan2(dy2, dx2);
            var deg = (deg2 - deg1);
            if ((deg * 180 / Math.PI) % 180 == 0) {
                flg = false;
                break;
            }
            else if (deg > 0)
                cnt_p += 1;
            else if (deg < 0)
                cnt_m += 1;
        }
        if (cnt_p == 2 && cnt_m == 1 ||
            cnt_p == 1 && cnt_m == 2) {
        }
        else {
            flg = false;
        }
        if (flg)
            count += 1;
    }
}
if (count == 10)
    console.log("YES");
else
    console.log("NO");