Multiply the numbers . It multiplies each digit of second string to each digit of first and stores the result .
for i in range ( n - 1 , - 1 , - 1 ) : NEW_LINE INDENT for j in range ( m - 1 , - 1 , - 1 ) : NEW_LINE INDENT result [ i + j + 1 ] += ( int ( s1 [ i ] ) * int ( s2 [ j ] ) ) NEW_LINE DEDENT DEDENT