freq[ "ghi djksiwlabc dksoabcndjdksueos"]

Out[18]=

  {{a, 2}, {b, 2}, {c, 2}, {d, 4}, 
    {e, 1}, {f, 0}, {g, 1}, {h, 1}, 
    {i, 2}, {j, 2}, {k, 3}, {l, 1}, 
    {m, 0}, {n, 1}, {o, 2}, {p, 0}, 
    {q, 0}, {r, 0}, {s, 4}, {t, 0}, 
    {u, 1}, {v, 0}, {w, 1}, {x, 0}, 
    {y, 0}, {z, 0}}

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