converting a string to a matrix

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hi, i have a string that i would like all its values to be stored in a matrix but when i use square brackets([ ]) to store it as a matrix it still gives me the answer as a string. How do i add those values to a matrix

this is the string:

A = 
    "0.00045"    "0.00056"    "0.0007"     "0.00086"
    "0.00067"    "0.0008"     "0.00094"    "0.00109"
    "0.00092"    "0.00106"    "0.00119"    "0.00132"
    "0.00117"    "0.00133"    "0.00147"    "0.00159"
    "0.00144"    "0.00162"    "0.00177"    "0.00189"
    "0.00174"    "0.00193"    "0.00208"    "0.0022" 
    "0.00235"    "0.00253"    "0.00263"    "0.00266"
    "0.00311"    "0.00331"    "0.00343"    "0.0035"