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larr PROGRAMMING FOUNDATIONS COURSE EXAM

INSTRUCTIONS

Description

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MEDIUM

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In a laboratory, there are various chemicals, and each chemical is

represented by a symbol such as $H,B,C,O,F,$ etc. A student

has added chemicals to a jar one by one. He wants to know the

chemical mixture that he created using the chemicals.

Given a string of chemical symbols that represent the order in which

the student added the chemicals to the jar. Write a program to print a

string with each chemical symbol along with the number of times it is

added continuously. Join different chemical symbols using the plus

$(+)$ as shown in the sample output.

If a chemical is added only once without any repetition,

print the chemical name without its count.

Ex: "HHCOO" $=>"H2+C+O2$

Input

The input will be a single line containing a string representing a

sequence of chemical symbols.