#include <stdio.h>
#include<string.h>
int main()
{
    char a[100];
    int i,j,k,len;
    gets_s(a);
    len= strlen(a);/*计数器:遇到'\0'停止并返回计数器值*/
    for(i=0;i<len/2;i++)
        for(j=0;j<len-2;j+=2)
        if (a[i] > a[i + 2])
        {
            k = a[i]; a[i] = a[i + 2]; a[i + 2] = k;
}
    for (i = 0; i < len; i++)
    printf("%3c", a[i]);
}

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