Text formating

Dear all

I had input file as mention below and want op as mention.

Kindly let me knw possible ways.

Regards
Jaydeep

INPUT:

RXOTX-48-1
2A 34
2B 35
RXOTX-499-2
2C 32
RXOTX-4-1
2D 23

OUTPUT:

RXOTX-48-1 2A 34 2B 35
RXOTX-499-2 2C 32
RXOTX-4-1 2D 23

nawk ' /RXOTX/{l++} { _[l] = _[l]" "$0 } END{ for( i=1; i <= l; i++ ){ print _} } ' infile

similar to this

awk '{printf (/RXOTX/)?"\n"$0" ":$0" "}' urfile