[R] how to extract values from a raster according to Lat and long of the values?

[Jonsson]

having 12 files with 12 hdrs for one year:    these files are raster
(projected  WGS84,lat
long):https://echange-fichiers.inra.fr/get?k=rLSyoavrnifGyH5XrlO

              samples = 1440
               lines   = 720
               bands   = 1
               header offset = 0
               file type = ENVI Standard
               data type = 4
               interleave = bsq
                byte order = 0
          map info = {  Geographic Lat/Lon, 1, 1, -180, 90, 0.25,
0.25,WGS-84}
            coordinate system string =
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",
                     SPHEROID["WGS_1984",6378137,298.257223563]]
           ,PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
                     }
These lines will open the files as a list:

          a<-list.files("D:\\ECV\\2010", "*.envi", full.names = TRUE)
               for(i in 1:length(a)){
                d <- raster(a[i]}

I would like to extract the values correspond to  44.8386° N, 0.5783° W from
all files as txt file 



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