Create a stem-and-leaf plot

Python 2, 78 75 79 bytes

s=-1
for i in sorted(input()):
 if i/10^s:s=i/10;print'\n%d-'%s,
 print`i`[-1],

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Jelly, 17 bytes

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Retina, 38 30 bytes

Thanks to Neil for saving 2 bytes, and to Leo for saving another 6.

Byte count assumes ISO 8859-1 encoding.

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Input is a linefeed-separated list of integers. Output omits empty prefixes.

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