[PrinceKumar]

use value above >50 u can use 128, 64, 32, 8, 1024,1200 ... it depends on you that how much big string you want ... if you want not a big string then in these cases you can use 64, 128, 256, 512
edit: i haven't mentioned here that how to give them message if player string is more than allowed values..
n u can easily check that .. using..
if(strlen(reason) > here your charc.. value) SendClientMessage(.......);