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use warnings;
use strict;
...
    print join ' ', grep {/^[+-]?\d+(\.\d*)?$/} split;
    print "\n";
}

1 1549367 11 8 3 11 0 -12.00 6.00 -0.25 -3.00 0.00 -1.67 -12.00 6.00 -
+0.64
1 1549501 15 12 3 3 12 -17.00 6.00 0.50 1.00 6.00 2.67 -17.00 6.00 0.9
+3
...
2 1549815 9 7 2 8 1 -3.00 6.00 -0.14 -9.00 0.00 -4.50 -9.00 6.00 -1.11
1 1549914 12 11 1 9 3 -9.00 6.00 1.18 -4.00 -4.00 -4.00 -9.00 6.00 0.7
+5
1 1550018