local fmt = require "fmt"

class A
    function __construct(public age, public name)
    end
end

class B
    function __construct(public character, public nemesis)
    end
end

local tableA = {
    new A(27, "Jonah"),  new A(18, "Alan"), new A(28, "Glory"),
    new A(18, "Popeye"), new A(28, "Alan")
}

local tableB = {
    new B("Jonah", "Whales"), new B("Jonah", "Spiders"), new B("Alan", "Ghosts"),
    new B("Alan", "Zombies"), new B("Glory", "Buffy")
}

local h = {}
local i = 1
for tableA as a do
    local n = h[a.name]
    if n then
        n:insert(i)
    else
        h[a.name] = {i}
    end
    i += 1
end

print("Age  Name   Character Nemesis")
print("---  -----  --------- -------")
for tableB as b do
    local c = h[b.character]
    if c then
        for c as j do
            local t = tableA[j]
            fmt.print("%3d  %-5s  %-9s %s", t.age, t.name, b.character, b.nemesis)
        end
    end
end