(function() {
    'use strict';

    var fs = require('fs');
    var contents = fs.readFileSync('/dev/stdin', 'utf-8');

    var printRec = function(contents) {
        var lines = contents.trim().split("\n");
        for (var i = 0; i < lines.length; i++) {
            var b = lines[i].split(" ");
            var H = parseInt(b[0]);
            var W = parseInt(b[1]);

            if (H === 0 && W === 0) {
                break;
            }
            for (var h = 0; h < H; h++) {
                for (var w = 0; w < W; w++) {
                    process.stdout.write("#");
                }
                process.stdout.write("\n");
            }
            process.stdout.write("\n");
        }
    }
    printRec(contents);
})();