$fn=100;

difference (){
    cylinder (5, 10, 10);
    translate([0,0,-10]) cylinder (100, 9, 9);
    }

difference(){
   translate([0,13,2])rotate([90,0,0])cylinder(4,9,9);
   translate([0,15,2])rotate([90,0,0])cylinder(5,7.5,7.5);
}


t = "J";

rotate([-90,180,180])translate([-6,-2,-13]){
    linear_extrude(4) {
        text(t, 11,font= "Mongolian Baiti:style=Regular");
}
}
d = "A";

rotate([-90,180,180])translate([-4,-3.5,-13]){
    linear_extrude(4) {
        text(d, 11,font= "Mongolian Baiti:style=Regular");
}
}