CodeForces Problems Difficluty level

How to find difficult problems on CodeForces ?

All i see is a list of problems with nothing given about the difficulty level

http://codeforces.com/problemset

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May be u should sort the problems on no. of submissions.

Difficulty level are there in the form of alphabets.
Difficulty is in increasing order of alphabets.
A is the easiest and F is the hardest.

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