i=raw_input()
if i[1]>"9":print"2CH4 + 4O2 > 4H2O + 2CO2"
else:O=3*int(i[1:i.find('H')])+1;C=2*int(i[1:i.find('H')]);print"2"+i+" + "+`O`+"O2"+" > "+i[i.find('H'):]+"H2O"+ " + "+`C`+"CO2"
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