You are given a set of square coordinates where we have placed white pawns. You should count how many pawns are safe.

def safe_pawns(pawns):
    pawns = [pawns[i:i + 2] for i in range(0, len(pawns), 2)]
    pawns = [chr(int(pawn[0]) + 97) + str(int(pawn[1]) - 1) for pawn in pawns]
    count = 0
    for pawn in pawns:
        if chr(ord(pawn[0]) - 1) + str(int(pawn[1]) - 1) in pawns or chr(ord(pawn[0]) + 1) + str(int(pawn[1]) - 1) in pawns:
            count += 1
    return count