A train from Chongqing to Kunming had 764 passengers on board when it departed from Chongqing, 137 people got off the train when it arrived at Guiyang Station, some got on, and there were 783 passengers on board when the train departed from Guiyang. How many people get on the bus in Guiyang?
一列从重庆到昆明的火车，从重庆始发时车上有乘客764人，到贵阳站时有137人下车，有一些人上车，火车从贵阳开出时车上有783人．在贵阳有多少人上车？
<gadget id="calculator">764 - 137</gadget>
<output>627</output>

<gadget id="calculator">783 - 627</gadget>
<output>156</output>

<result>156</result>