zeros at the front of numbers

i am sure this is probably really easy......i have to copy and paste values from an sap program over to excel spreadsheets, and I usually do about 15 at a time that end up in a column: 15 different cells. The value I am copying are ID numbers that all begin with zero and excel automatically removes the zeros at the front of each number.

Is there a formula/process for preventing this.

Thanks guys!