new str[10];
new allowedchars[][2] =
{
"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z" //26
};
format(str, 10, "%s%i%i%i%s%s52", allowedchars[random(sizeof(allowedchars))],random(9),random(9),random(9)...