Just use $input or $?=""...
alias GetInfo {
var %data1 = $?="Enter 1"
var %data2 = $?="Enter 2"
var %data3 = $?="Enter 3"
echo -a %data1 ~ %data2 ~ %data3
}
You can do the same thing with $input. Just remember that you can't put $input or $?="" in certain events unless you use a timer.