java.lang.NumberFormatException

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    • java.lang.NumberFormatException: null at java.lang.Integer.parseInt(Integer.java:542) at java.lang.Integer.parseInt(Integer.java:615) at Social.toString(Social.java:46) at java.lang.String.valueOf(String.java:2994) at java.io.PrintStream.println(PrintStream.java:821) at SocialRunner.main(SocialRunner.java:20)

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