little typos
little typos

tempest67/checkio-mission-building-base,Bryukh-Checkio-Tasks/checkio-mission-building-base,tempest67/checkio-mission-building-base,Bryukh-Checkio-Tasks/checkio-mission-building-base,Bryukh-Checkio-Tasks/checkio-mission-building-base,tempest67/checkio-mission-building-base