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use failure::*;
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pub fn solve(input: &str) -> Result<String, Error> {
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let input: Vec<u32> = input
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.trim()
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.chars()
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.map(|x| x.to_digit(10).ok_or_else(|| format_err!("")))
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.collect::<Result<_, _>>()?;
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// 1
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let offset = 1;
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let offset_iter = input.iter().skip(offset).cycle().take(input.len());
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Ok(
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input
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.iter()
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.zip(offset_iter)
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.filter(|&a| a.0 == a.1)
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.map(|a| a.0)
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.sum::<u32>()
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.to_string(),
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)
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}
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