#include <iostream>
#include <algorithm>
bool ok(const std::string &input) {
return std::find_if_not(
input.begin(), //from beginning
input.end(), //to end
isalpha //check for non-alpha characters
) == input.end();
}
int main() {
std::cout <<
ok("abc") << '\n' <<
ok("123") << '\n' <<
ok("1.4") << '\n' <<
ok("abc8def") << '\n' <<
ok("My name is Chris.");
}
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