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#Bash, 14

printf %$#d $@

Input list given at the command line.

Not much to explain here. Simply uses built-in printf facilities to do the necessary padding, based off the number of passed args:

• $# is the number of args passed
• %<n>d is a printf format specifier that prints an integer with up to n leading spaces
• $@ is the list of all args passed
• The format specifier is reused for each member of $@.

Ideone.