Hi Ronaldo,
REPORT zao.
START-OF-SELECTION.
*-----------------------
DATA: v_catly(8)TYPE n VALUE78213970.
IF v_catly CO'0123456789'.
WRITE: 'numbers'.
ENDIF.
*----------------------
DATA: lv_str TYPE string.
lv_str = '782g13970'.
FINDFIRSTOCCURRENCEOFREGEX'([a-zA-Z])'IN lv_str.
IF sy-subrc = 0.
WRITE:/ 'letter'.
ENDIF.