how do we hook up our water lines(hot&cold) to water heater?

we took out old and forgot to remember how the lines were hooked up. got cold and hot in kitchen and bathroom only cold any help would be helpful

Answers:
Most of the time when facing a wall where hot and cold water is coming out of the wall, hot is on the left and cold is on the right.
The water heater should be marked as to which one is which.
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