How to count the values before negative numbers if negative numbers appear multiple times?

My output is like this:

0.2856   -0.2560   -0.2546   -0.2549   -0.3652   -0.2376    0.2469    0.2645    0.2638    0.2635   -0.6497    0.3110
0.3132    -0.7653  -0.2451    0.542    -0.987    0.143     -0.386    -0.911    -0.123  

Here, Negative numbers appear 4 occations. (5 times, 1 time, 2 times and 3 times). I want to show the number of values before each

occations. For example, number of values are 13 before negative appears 2 times. The output is supposed to be like this:

1 10 13 16 18

How can I do that?