Stanley wrote a 4-digit number on a piece of paper and challenged Darrell to guess it. All the digits were different.

Darrell: Is it 4607 ?

Stanley: Two of the numbers are correct but they are positioned wrongly.

Darrell: Could it be 1385 ?

Stanley: My answer is the same as before

Darrell: How about 2879 ?

Stanley: Wow, two of the numbers are correct and in the right places as well.

Darrell: 5461 ?

Stanley: None of the digits is correct.

What was the number ?