KöMaL 2015 K459

Uncle Charlie had a ladder of length 2 metres and 60 cm. In order to replace a light bulb in a lamp on the wall, he leaned the ladder against the wall, with the bottom end at a distance of 156 cm from the wall. It turned out that he would need to climb 32 cm higher in order to reach the bulb, so he pushed the bottom of the ladder closer to the wall. By how many centimetres did he push it closer?