How to check if all items in a row is string or not

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     L.MM.CMAP1 L.MM.CMAP2 L.MM.CMAP3 L.MM.DML L.MM.DUR1
1        2.7        1.9        1.8     12.8      12.8
2        NA         NA         NA       NA        NA
3       12.9       10.7        NA      4.6       7.1
4        6.5        3.0        NA      33.8      40.6

The items in this list are either a double or string("NA") I want to change "NA"s to 0 (double), if any item in the same row is a double. I want to leave "NA" as "NA", if all the items in the same row are "NA".

     L.MM.CMAP1 L.MM.CMAP2 L.MM.CMAP3 L.MM.DML L.MM.DUR1
1        2.7        1.9        1.8     12.8      12.8
2        NA         NA         NA       NA        NA
3       12.9       10.7         0      4.6       7.1
4        6.5        3.0         0      33.8      40.6

Thank you in advance!

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