Run EMR job with output results in another AWS account S3 bucket

I'm trying to run an EMR job in java where the input files are in the S3 bucket for one account and the output results are written to an S3 bucket for a different account. I understand you can give read/write permissions from one account to the other, but how would specify that the input and output are in different directories?

For example, you might specify the input path as "http://s3{bucket-name}/{input-folder}/" and output path as "http://s3{bucket-name}/{output-folder}/". How would you specify a bucket in another account?