Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Premier Sir Charles Cowper (1807-1875) KCMG left office 2 October 1856, when did he assume office?

### Inputs:
table_name: table, columns: ['Rank:', 'State:', 'Premier:', 'Party:', 'Assumed office:', 'Left office:', 'TOTAL Time in office:']

### Response:
SELECT Assumed office: FROM table WHERE Premier: = sir charles cowper (1807-1875) kcmg AND Left office: = 2 october 1856