l=raw_input()\x0d if l[0]=="M":print"2Mg+O2->2MgO"\x0d if l[0]=="H":print"2H2+O2->2H2O"\x0d if l[0]=="C":print"2C2H2+5O2->4CO2+2H2O"
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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