發送短信 : Re-colorization with random walks

 _    _      ___                _____     _  _   
| |  | ||   / _ \\      ___    |  ___||  | \| || 
| |/\| ||  | / \ ||    /   ||  | ||__    |  ' || 
|  /\  ||  | \_/ ||   | [] ||  | ||__    | .  || 
|_// \_||   \___//     \__ ||  |_____||  |_|\_|| 
`-`   `-`   `---`       -|_||  `-----`   `-` -`  
                         `-`