In a convenience store, at the end of a shift, actual money must equal required money. In a particular shift, there was an overage of $10. The overage was not due to counting mistake but a cashier failed to key in a sale. He just opened the drawer, and put the money, $10. The coming shift took over with this overage of $10. At the end of the second shift, there was a shortage of $60. Assuming that there was no counting mistake with the actual money, how much money was lost during the second shift?